I was introduced to the concept of bookmark allusions when I read the wonderful book by Frank X. Roberts, Ph.D., (2019, Reprint), Essays on Bookmarks and Related Topics.  In this book, pages 107-115, Dr. Roberts tells the story of his hobby of searching for allusions to bookmarks in his reading:
"A hobby of mine is to make mental and written notes to myself whenever I come across an allusion to the use of a bookmark of any kind, in any shape or form, in my reading.  I make no effort to hunt for such allusions, but just let them find me serendipitously, so to speak.  When the mention of the use of a bookmark, or some synonym of substitute for one, appears unexpectedly on the page, it gives me a pleasant start.  I experience a momentary kick, like the thrill of discovering some long-sought-for book on the shelves of a used bookstore". - Frank X. Roberts, Ph.D
After sharing some examples of his finds, Dr. Roberts goes on to give guidelines for collecting bookmark allusions....
"First, bookmark allusions must arrive unexpectedly - no surprise, no thrill.  Second, books, articles, etc. specifically about bookmarks are obviously not sources for collecting bookmark allusions.  Third, printed materials of all forms and genres can be sources (books, articles, pamphlets, magazines, newspapers, fiction, nonfiction, etc.) as long as at the outset, these in no way signal that a bookmark allusion is necessarily to be encountered in reading them".
Dr. Roberts says that "as hobbies go, collecting bookmark allusions is cheap, educational, informative, undemanding, relaxing, effortless, unavoidable and even thrilling.  Give it a try".  So, here I am giving it a try!  I will watch out for bookmark allusions in my reading from now on, and when I find any I will add them here on this page.  Secondly, slightly operating outside Dr. Roberts guidelines, because of my eagerness to find and share more bookmark allusions with you, I have searched online and found quite a few bookmark allusions which I share with you below.  Even though I hunted for them online, rather than letting them "arrive unexpectedly" in my paper-based reading, it was still surprising, thrilling and fun!  

NOTE:  Where a quote is not a bookmark allusion (as defined by Dr. Roberts), I add them to my BOOKMARK QUOTES page.
OTHER BOOKS ON BOOKMARKS BY FRANK X. ROBERTS

St. Augustine’s Finger: Medieval Bookmarks and Related Topics  

Books/Bookmarks Through The Ages: An Annotated Bibliography

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1. BOOKMARK ALLUSIONS IN FICTION AND NONFICTION
(found by me serendipitously in my paper-based reading)
"Later on, while reading this book, and when less and less pages accumulated behind our now already archaic receipt from Coles I used as a book mark, I realised that my general behaviour would be totally repulsive to the book's author.  The most striking sin I am ridden with would be my interrupting others while they speak." ― George Dloughy, This (Interrupting) Life, The Weekend Australian (Newspaper), March 20-21, 2021.  [The book and author Dloughy is referring to in his story  is How to Win Friends and Influence People by Dale Carnegie, first published in 1936.  'Coles' is a major Australian supermarket chain].
2. BOOKMARK ALLUSIONS IN FICTION AND NONFICTION
(found by me searching online)
Click on the book title to find out more about the book
“You know, when people familiar with the mountains enter the wilds, they often look for a branch that stands out, break it to mark their tracks. It’s useful on the way back. It’s called a shiori, a folded branch, just like the word for bookmark. It is written differently but is pronounced the same.” ― Kanji Hanawa, Backlight
“If you had to pack your whole life into a suitcase--not just the practical things, like clothing, but the memories of the people you had lost and the girl you had once been--what would you take? The last photograph you had of your mother? A birthday gift from your best friend--a bookmark embroidered by her? A ticket stub from the traveling circus that had come through town two years ago, where you and your father held your breath as jeweled ladies flew through the air, and a brave man stuck his head in the mouth of a lion? Would you take them to make wherever you were going feel like home, or because you needed to remember where you had come from?” ― Jodi Picoult, The Storyteller
“Second hand books had so much life in them. They'd lived, sometimes in many homes, or maybe just one. They'd been on airplanes, traveled to sunny beaches, or crowded into a backpack and taken high up a mountain where the air thinned.

"Some had been held aloft tepid rose-scented baths, and thickened and warped with moisture. Others had child-like scrawls on the acknowledgement page, little fingers looking for a blank space to leave their mark. Then there were the pristine novels, ones that had been read carefully, bookmarks used, almost like their owner barely pried the pages open so loathe were they to damage their treasure.

I loved them all." ― Rebecca Raisin, The Little Bookshop on the Seine
“To use an electronics analogy, closing a book on a bookmark is like pressing the Stop button, whereas when you leave the book facedown, you've only pressed Pause.” ― Anne Fadiman, Ex Libris: Confessions of a Common Reader
“When a bookmark tumbles out of an old book pristine and unwrinkled, it is like a gasp of breath from another century.” 
― Don Borchert, Free for All: Oddballs, Geeks, and Gangstas in the Public Library
“I try not to cringe. Dog-earing a book feels like a violation of some sacred unspoken rule.” ― Julie Murphy, Puddin'
"And she'd use anything she could find for a bookmark. My missing sock, an apple core, her reading glasses, another book, a fork". ― Kami Garcia, Beautiful Creatures
"I thought of the Australian gum leaf, which was an ideal shape for a bookmark and a pretty thing. In the middle of the night I awoke, and in fancy, saw peeping over a long gum leaf, a little bush sprit with a gum nut on its head".  ― May Gibbs, from May Gibbs, Mother of the Gumnuts by Maureen Welsh.
“But if Miss Golightly remained unconscious of my existence, except as a doorbell convenience, I became, through the summer, rather an authority on hers. I discovered, from observing the trash-basket outside her door, that her regular reading consisted of tabloids and travel folders and astrological charts; that she smoked an esoteric cigarette called Picayunes; survived on cottage cheese and Melba Toast; that her vari-colored hair was somewhat self-induced. The same source made it evident that she received V-letters by the bale. They were torn into strips like bookmarks. I used occasionally to pluck myself a bookmark in passing. Remember and miss you and rain and please write and damn and goddamn were the words that recurred most often on these slips; those, and lonesome and love.” ― Truman Capote, Breakfast at Tiffany's 
“Dumb. He should have gotten the pen. Jewelry was so public... and personal, which was why he'd bought it. He couldn't buy Eleanor a pen. Or a bookmark. He didn't have bookmarklike feelings for her.” ― Rainbow Rowell, Eleanor & Park
“She stuck a bookmark in his heart and walked away.” ― Saul Williams, She
“But Neve, you can’t start a book and leave it halfway through,’ he’d said implacably. ‘It’s almost as bad as turning down the corner of the page, instead of using a bookmark.” ― Sarra Manning, You Don't Have to Say You Love Me
“It was also a room full of books and made of books. There was no actual furniture; this is to say, the desk and chairs were shaped out of books. It looked as though many of them were frequently referred to, because they lay open with other books used as bookmarks.” ― Terry Pratchett, Going Postal
“He pulled a book out of the debris in front of him and opened it at the piece of bacon he’d used as a bookmark.” 
― Terry Pratchett, Mort
“Fortune favours the brave, sir," said Carrot cheerfully.

"Good. Good. Pleased to hear it, captain. What is her position vis a vis heavily armed, well prepared and excessively manned armies?"

"Oh, no–one's ever heard of Fortune favouring them, sir."

"According to General Tacticus, it's because they favour themselves," said Vimes. He opened the battered book. Bits of paper and string indicated his many bookmarks. "In fact, men, the general has this to say about ensuring against defeat when outnumbered, out–weaponed and outpositioned. It is..." he turned the page, "'Don't Have a Battle.'"

"Sounds like a clever man," said Jenkins. He pointed to the yellow horizon. ― Terry Pratchett, Jingo
“The Patrician watched him for a while, and then took a book off the little shelf beside him. Since the rats couldn't read the library he'd been able to assemble was a little baroque, but he was not a man to ignore fresh knowledge. He found his bookmark in the pages of Lacemaking Through the Ages, and read a few pages.

After a while he found it necessary to brush a few crumbs of mortar off the book, and looked up.

“Are you achieving success?” he inquired politely.” ― Terry Pratchett, Guards! Guards!
“Sherlock: If the occasional pile of clutter offends you, by all means move it. 
John: Last time I tried that I was bitten by a large spider you appeared to be using as a bookmark.” 
― Guy Adams, Sherlock: The Casebook
“I put my book down, finding a Post-it note to use as a bookmark, because folding the corner of a page—even in a thirty-year-old book—is sacrilege.” ― Simone St. James, The Sun Down Motel
“He even let me smoke a cigarette in his office, but he urged me to quit smoking because of the health risks. He even had a pamphlet in his desk that he gave me. I now use it as a bookmark.” ― Stephen Chbosky, The Perks of Being a Wallflower
“This Land is mostly white space on the map...which is how it should be; I'll leave more detailed map making to those graduate students and English teachers who feel that every goose which lays gold must be dissected so that all of its quite ordinary guts can be labelled; to those figurative engineers of the imagination who cannot feel comfortable with the comfortably overgrown (and possible dangerous) literary wilderness until they have built a freeway composed of Cliff's Notes through it - and listen to me, you people: every English teacher who ever did a Monarch or Cliff's Notes ought to be dragged out to his or her quad, drawn and quartered, then cut up into tiny pieces, said pieces to be dried and shrunk in the sun and then sold in the college bookstore as bookmarks.” ― Stephen King, Danse Macabre
“When Samuel was a child reading a Choose Your Own Adventure novel, he’d keep a bookmark at the spot of a very hard decision, so that if the story turned out poorly, he could go back and try again. More than anything he wants life to behave this way.” ― Nathan Hill, The Nix
“She looked closer at the object she’d mistaken for a bookmark—a length of metallic silver tinged with hints of bright mandarin. She picked it up, holding it aloft as it glinted in the gas lamps’ glare.

Aasim cursed, his voice going hoarse. “Is that what I think it is?”

Fatma nodded. It was a metallic feather, as long as her forearm. Along its surface, faint lines of fiery script moved and writhed about as if alive.

“Holy tongue,” Aasim breathed.

“Holy tongue,” she confirmed.

“But that means it belongs to . . .”

“An angel, ” Fatma finished for him.

Her frown deepened. Now what in the many worlds, she wondered, would a djinn be doing with one of these?” 
― P. Djeli Clark, A Dead Djinn in Cairo
“I don’t always have to be right, I just need to make sure you realize you’re always wrong. Are we on the same page here? No? Lemme get you a bookmark.” ― Celia Kyle, Big Furry Deal
“The next morning, they cremated my grandfather in the belly of our ship. I still have a scarp of the outfit he made for me. These days, I use it as a bookmark.” ― Brian K. Vaughan, Saga, Vol. 2
“Most of the books I have are indicators of my insecurity. I really wanted to be an intellectual. I really wanted to understand Sartre. I thought that was what made people smart. I have tried to read Being and Nothingness no fewer than twenty times in my life. I really thought that every answer had to be in that book. Maybe it is. The truth is, I can’t read anything with any distance. Every book is a self-help book to me. Just having them makes me feel better. I underline profusely but I don’t retain much. Reading is like a drug. When I am reading from these books it feels like I am thinking what is being read, and that gives me a rush. That is enough. I glean what I can. I finish some of the unfinished thoughts lingering around in my head by adding the thoughts of geniuses and I build from there. There are bookmarks in most of the denser tomes at around page 20 to 40 because that was where I said, “I get it.” Then I put them back on the shelf.” ― Marc Maron, Attempting Normal
“The morning after their deaths, Armand had gone into their room. The scent of them, the sense of them, almost too much to bear. The clothing. The book. The bookmark. The bedside clock, still ticking. He'd thought that strange. Surely it should have stopped.” ― Louise Penny, A Great Reckoning
“I,” I start, and she turns to look at my lips moving, rehearsing for some grand proposal. “I think it’d be good idea if you brought a few books over and left them on my shelf.” I’m a writer, and this is as good as it gets. She didn’t need a ring, just the ability to borrow a bookmark whenever she needed, or unwritten or unspoken permission to take my copy of Cecil Brown’s The Life and Loves of Mr. Jiveass Nigger with the original cover.” ― Darnell Lamont Walker, Book of She
“The house had always been full of books, far too many for one person to get through in a lifetime. Her father didn't collect them to read, to own first editions or to keep those signed by the author; Gil collected them for the handwritten marginalia and doodles that marked the pages, for the forgotten ephemera used as bookmarks. Every time Flora came home he would show her his new discoveries: left-behind photographs, postcards and letters, bail slips, receipts, handwritten recipes and drawings, valentines and tickets, sympathy cards, excuse notes to teachers; bits of paper with which he could piece together other people's lives, other people who had read the same books he held and who had marked their place.” ― Claire Fuller, Swimming Lessons
“I slid a bookmark in to flag where I’d been up to, because only an ignorant, soulless monster doomed to burn in hell for all eternity would dog-ear a page.” ― Kylie Scott, Trust
“In the republic of poetry, poets rent a helicopter to bombard the national palace with poems on bookmarks, and everyone in the courtyard rushes to grab a poem fluttering from the sky, blinded by weeping.” 
― Martin Espada, The Republic of Poetry: Poems
“In the early years of the Civil War, she continued to lecture and make other celebrity appearances. She visited the Old Ladies Home in New York City, where she bought a needlepoint bookmark in the shape of a Latin cross. She shopped in Boston. She visited the Abbotts in 1863. And in 1864, she learned that the Mohave leader who had orchestrated her adoption into the tribe was coming east. After a chain of events on the Colorado that Olive could never have imagined during her life as a Mohave, Irataba, now a Mohave diplomat and leader revered by whites, was in the city after a visit with President Lincoln in Washington. She bought herself a ticket to see him.” ― Margot Mifflin, The Blue Tattoo: The Life of Olive Oatman
“Grampa’s long beard was serving as a bookmark in a well-thumbed paperback with a Western-themed cover. I never knew what would catch Grampa’s fancy in the book department. He was as likely to be caught reading a gothic romantic suspense as he was a snowblower repair manual.” ― Jessie Crockett, Maple Mayhem
“A good book to read and another to press flowers and herbs – pressed flowers and herbs make wonderful bookmarks.” 
― Patti Roberts, The Witches' Journal
“There are readers who live, breath, inhale stories and, while immersed in a book, live a divided life. Part of them is always waiting in that fictional world for the story to continue, suspended at the moment the page was last bookmarked. That's who I write for,” 
― Ian W. Sainsbury, Children Of The Deterrent
“As I write this it’s occurring to me that the books I most adore are the ones that archive the people who have handled them—dogears, or old receipts used as bookmarks (always a lovely digression). Underlines and exclamation points, and this in an old library book! The tender vandalisms by which, sometimes, we express our love.” ― Ross Gay, The Book of Delights: Essays
“Good morning, magazines! Good morning, bookmarks! Good morning, books! Good morning, store!” 
― Gabrielle Zevin, The Storied Life of A.J. Fikry
“Now don't think I've lost my mind - but I'll tell you, I'll look at some of the cards I have, some of Van Gogh's pictures of the poor, the coal miners, or Daumier's, and I talk to those pictures! I look, and I speak. I get strength form the way those writers and artists portrayed the poor, that's how I've kept going all these years. I pray to God and go visit him in churches; and I have my conversational time with Van Gogh or with Dickens - I mean, I'll look at a painting reproduced on a postcard, that I use as a bookmark, or I read one of those underlined pages in one of my old books, and Lord, I've got my strength to get through the morning or afternoon!  ― Dorothy Day, The Reckless Way of Love: Notes on Following Jesus
“Daughter of the past who walked in all wide-eyed and exhaling like she’d finally found what she was looking for. It was a look I knew well. So glad to be in a cozy bookshop, in air-conditioned comfort, surrounded by stories, and to find that in the chaos of the world there was still a place like this. A place where books were piled to the ceiling and tables were crowded with the paraphernalia of reading: bookmarks, reading lights, stationery, pens and framed quotes to inspire.” 
― Patti Callahan Henry, The Bookshop at Water's End
“My own Grandmother and Mother are anti gadget. One time I saw my Mom using the kindle I got her for Christmas as a bookmark in a paperback book.” ― Gina Henning, How to Bake the Perfect Christmas Cake
“I cannot BELIEVE the nerve of some people, dog-earing the pages of the books! Do they think they OWN the books? I think you should give a bookmark to every single person who checks out a book. I mean it. THEY ARE RUINING EVERYTHING! I will help make the bookmarks if that's what it takes.” 
​― Gina Sheridan, I Work at a Public Library: A Collection of Crazy Stories from the Stacks
“Reaching into her pack again, Ceony pulled out a simple bookmark, long and pointed at one end. She handed it to Zina. 
Her sister crooked an eyebrow. “Uh, what is this?” “A bookmark,” Ceony explained. “Just tell it the title of the book you’re reading and leave it on the nightstand. It will keep track of what page you’re on by itself.” She pointed to the center of the bookmark, where she’d overlaid a small square of paper. “The page number will appear here, in my handwriting. It should work for your sketchbooks, too.”Zina snorted. “Weird. Thanks.” ― Charlie N. Holmberg, The Glass Magician
“I want to ask you a question: Who buys bookmarks?"    "What do you mean? People who love books?"     "You would think, right? But you're wrong. People who read books on the regular, yes, they buy bookmarks. But that rare breed like myself, and apparently our Ms. Cardinal here, people who snuggle with books, they don’t buy bookmarks."      "No?"      "No, we don’t, said Allie, turning pages carefully. "We go through books like crazy. And we'll stop in the middle of one to start another, and then go back to the first one after a long period of time, and we use whatever's at hand to mark our place; a receipt, a ticket stub, a tissue” ― Leslie Leigh, Murder in Wonderland
Noah didn’t lift his head from his magazine. Laura waited a minute to see if he would move. He didn’t, so she sighed deeply, placed a bookmark in her novel, and reached over to shake his arm. Noah had developed a habit of dozing off while reading in bed. Laura had no idea how he found that position comfortable enough for sleeping, and she didn’t understand why he was so tired all the time lately. ― Melissa F. Miller, Irreparable Harm
“Sources of Surprise: Make the time to read outside your immediate specialty—if necessary, taking time from more “active” tasks. Stick bookmarks in promising places, then graze the marked passages later. Allow yourself to become enthralled once in a while.” ― Peter Schwartz, The Art of the Long View: Planning for the Future in an Uncertain World
“...confesses to utilizing questionable bookmark strategies, and self-identifies as a compulsive proofreader.” 
― Anne Bogel, I'd Rather Be Reading: The Delights and Dilemmas of the Reading Life
“He also created warning cards to insert in the questionable books. He wanted the cards to say, “This book is of the worst class that we can possibly keep in the library. We are sorry that you have not any better sense than to read it,” but he was persuaded to use a more restrained tone. The cards, shaped like bookmarks, said, “For Later and More Scientific Treatment of This Subject, Consult ______,” followed by a blank space for librarians to list better books on the topic.” ― Susan Orlean, The Library Book
“I can’t imagine what a fight between two librarians would look like. Did they hit each other with bookmarks?” 
― Andrew Hastie, Chimaera
“You gotta finish one book before you start reading another, whether there’s a happily ever after or not. You’ve put a bookmark in it and set it on the nightstand, and that doesn’t do anybody any good.” ― Summer Prescott, Bittersweet Murder
“The same year and closest to my heart, I was commissioned by the Los Angeles Metropolitan Transportation Authority to create a bookmark from my poem “Gossip" (women sharing the village news!)“ — Starr Goode, 'Adventures She Has Brought My Way', in Foremothers of the Women's Spirituality Movement: Elders and Visionaries.

Bookmark Allusion Bookmarks.

I am grateful to Jeff Carlock of Berkely, California, USA,
​for sending me these three bookmark allusion bookmarks he has created for his book group.  Thanks Jeff!
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This one is designed to be printed on both sides of a sheet of blue paper, so the English translation prints on the reverse side of the Italian original.
Jeff also sent me this delightful bookmark he created, saying "it's not strictly speaking a bookmark allusion, but it is about recalling a favorite passage in a book."  Indeed Jeff!  Thank you.
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