I wasn't going to do one of these "Your Appendix N" blog posts as, after some thought, I realised that my influences are not a list of novels and short stories - most of my RPG influences were somewhat circular in that they came from other RPG books and magazines. Anyway I changed my mind after seeing Noisms's list that contained a lot of non-novels.
Here are the seminal influences upon how I ran and created material for WFRP in the periods from the late 80s to mid 90s.
2000AD - especially Nemesis the Warlock (fantasy in space) and Strontium Dog.
BBC Television - Blackadder II for the Elizabethan setting.
Brittany and West coast of France - Many family holidays, especially Carnac (standing stones) and St. Emilion (extensive dusty urban ruins).
Dever, Joe and Chalk, Gary - Lone Wolf gamebooks (all). The Chalk-illustrated books are especially evocative of the WFRP atmosphere even though they obviously aren't WFRP. Oddly enough, Chalk wasn't Dever's first choice as illustrator - he originally wanted Brian Williams who ending up illustrating the series from The Cauldron Of Fear onwards.
Games Workshop/White Dwarf - All illustrative and advertising material from circa 1980 to circa 1990 (especially John Blance and Ian Miller), Warhammer 40000 Rogue Trader, box covers, miniatures, mono art in wargames rulebooks, graphic design, typefaces etc.
Herbert, Frank - Dune, Dune Messiah etc.
Holiday Brochures - Photo-material of Germany, Switzerland, Austria.
Jackson, Steve and Livingstone, Ian - All Fighting Fantasy stuff, especially City of Thieves and Creature of Havoc. Illustrations as well as plots, scenarios, encounters, creatures and traps.
Lovecraft, Howard Phillips - The Mountains of Madness.
Moorcock, Michael - Most Eternal Champion stuff, especially The Warhound and The World's Pain and The City In The Autumn Stars.
Russian Confederation - A week-long visit to Moscow in December 1993.
von Daniken, Erich - Chariots of the Gods and all other "Ancient Astronaut" nonsense.