You’ve just created them! They’re now in the library!
I guess I should expect a copyright lawsuit from Winston Groom, and a tweet from Trump.
If we’re including DVDs, I want to see Helix and Helix II, starring Anna Scott.
The Book of Ultimate Truths. Not the novel, The Book of Ultimate Truths. The Book of Ultimate Truths from The Book of Ultimate Truths, the work of Hugo Artemis Solon Saturnicus Reginald Arthur Rune.
All of the various pun-themed books from Chris Addison’s radio series The Ape Who Got Lucky.
Seconded:
The Rules of Acquisition, of course.
The Grasshopper Lies Heavy. The book The Man in the High Castle is about a man in a reality where the Nazis won the war who writes a book about a reality where the Nazis lost but so did Russia and now Britain and America are in a cold war for global domination. This is that book.
No horses in those movies, unfortunately… (see Notting Hill).
In Rosemary’s Baby, it’s mentioned that Edward Hutchins (Hutch) writes three series of boy’s novels under three fictitious names. Find them and stock them.
The “Tiny Sonny” books, written for children about a young football player–one position for each book. They’re mentioned in R. R. Knudson’s book Zanballer.
The Junior Woodchuck Manual–best do-it-yourself book EVAH!
The 432 volumes comprising The Adventures Of The Heterodyne Boys–by Various.
On How to Communicate in the Workplace by Baron Wulfenbach. Seven Popes have ordered it burned.
Noted contributors include Professor Roy Hinkley and Angus MacGyver. 
Bumped.
In the movie Misery, but not the book, Sheldon’s first novel after escaping from Annie Wilkes was The Higher Education of J. Philip Stone. His agent tells him it’s already getting great reviews.
Mark Corrigan’s Business Secrets of the Pharaohs, from Peep Show.
Spates Catalog
Probably dating myself a bit…
From Marvel Comics: The Book of the Vishanti and The Book of the Iron Fist.
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What you really want is El libro de arena. It’s a real page-turner…
Destiny’s Book from Sandman. Spoiler alert for everything.
From the Star Trek universe:
Anslem by Jake Sisko
Collected Stories by Jake Sisko
Hotel Royale by Todd Matthews
Chicago Mobs of the Twenties
The Complete Dixon Hill by Tracy Tormé
And some multimedia:
“Vulcan Love Slave Part 2: The Revenge” (holosuite program)
“Calisthenics Program of Lt. Worf” (holodeck program)
The Sandman series had several. It was practically a running joke, except sometimes it was played for dramatic effect. More than one story centered on one or more fictional books.
The Compendium of Srem
I forgot about the book from the movie “The World According to Garp”–Ellen, Garp’s biography of Ellen James.