When Metal Gear Solid 4 was released, multi-media store Tsutaya held a promotion for 15 movies that influenced MGS. For Metal Gear Solid: Peace Walker, it's not about movies, but books.
Publisher Hayakawa Shobu is kicking off "The Hayakawa Shobu Books That Made Hideo Kojima Fair" by fitting six of its titles that have influenced Kojima with a Peace Walker slip cover. Those titles are:
Shadow 81 by Lucien Nahum, High Citadel by Desmond Bagley, The Spy Who Came in from the Cold by John le Carre, Duck Call by Inami Itsuva, The Door into Summer by Robert A. Heinlein and Hothouse by Brian Aldiss.
All but Duck Call are originally English-language books.