@djjd62,
Some of the books seen in The Library of Dream in The Sandman by Neil Gaiman. These are all, or nearly all, real authors, but the titles given never existed (though in most cases they are closely related to or play on real-world titles by these authors).
The Fall of Gormenghast by Mervyn Peake
Road Trips to the Emerald City by Frank Baum
Arthur in Avalon by T.H. White
Alice's Journey Behind the Moon by Lewis Carroll
The Lost Road by J. R. R. Tolkien
The Man Who Was October by G. K. Chesterton
The Conscience of Sherlock Holmes by Arthur Conan Doyle
The Return of Edwin Drood by Charles Dickens
Love Can Be Murder by Raymond Chandler
Puddleby Papers by Hugh Lofting
Psmith and Jeeves by P. G. Wodehouse
The Last Voyage of Lemuel Gulliver by Jonathan Swift
The Emperor Over the Sea by C.S. Lewis
The Merrie Comedy of the Redemption of Dr. Faustus by Christopher Marlowe
The Bestselling Romantic Spy Thriller I Used To Think About On The Bus That Would Sell A Billion Copies And Mean I'd Never Have to Work Again by Anyone
Tarzan in Mars by E.R. Burroughs
my personal favourite