This is post #200 on this blog, and I thought I'd do something a little different - so here's my personal "Appendix N". Most of my books are in boxes; I'll come back and update this post with additional names, titles, and commentary as they are unearthed. The initial list here is fantasy, but I may expand it in the future to other genres.
Entries marked with a * are ones with a clear and sustained influence on my campaigns.
Anderson, Poul: THREE HEARTS AND THREE LIONS; THE HIGH CRUSADE; THE BROKEN SWORD
*Anonymous: The Mabinogion, particularly CULHWCH AND OLWEN.
*Cherryh, C. J.: the "Morgaine" cycle; The Tree of Swords & Jewels
*Cook, Glen: "Black Company" series; "Dread Empire" series; et al.
Crowley, John: LITTLE, BIG
*de Troyes, Chretein: Arthurian Romances
Eco, Umberto: Name of the Rose
Gaiman, Neil: Sandman comics, Good Omens (with Terry Pratchett), etc.
Hobb, Robin: "Farseer" trilogy, "Tawny Man" trilogy, "Soldier Son" trilogy; et al.
*Holdstock, Robert - Mythago Wood, et al
Hughart, Barry: Bridge of Birds et al.
*Jemisin, N.K: "The Hundred Thousand Kingdoms" series; et al.
*Kay, Guy Gavriel: TIGANA; "Fionavar Tapestry" trilogy; et al.
Le Guin, Ursula K.: "Earthsea" series; et al.
Leiber, Fritz: "Fafhrd & Gray Mouser" series; et al
Keyes, J. Gregory: "Fool Wolf" stories; "Kingdoms of Thorn and Bone" series; "Chosen of the Changeling" series
McKillip, Patricia: "The Riddle-Master of Hed" trilogy; A SONG FOR BASILISK; THE BOOK OF ATRIX WOLFE; et al.
McKinley, Robin: THE BLUE SWORD; THE HERO AND THE CROWN
Mieville, China: "Bas-Lag" series
Moon, Elizabeth: "The Deed of Paksenarrion" Trilogy
Moorcock, Michael: STORMBRINGER; STEALER OF SOULS; "Hawkmoon" series (esp. the first three books)
*Rohan, Michael Scott: "Winter of the World" series
Tolkien, J. R. R.: THE HOBBIT; "Ring trilogy"
Wells, Martha: The Ile-Rien series
Wolfe, Gene: "The Wizard Knight" duology; et al.
*Zelazny, Roger: JACK OF SHADOWS; "Amber" series; et al