For many old-school gamers who cut their teeth on Dungeons and Dragons, the Appendix N reading list from the AD&D Dungeonmaster’s Guide has become the archetype for gaming-related reading lists. As such, it referenced many obvious sources and inspirations for the rules such as Jack Vance’s Dying Earth series that were the basis for the game’s magic system. A similar reading list, credited to Barbara Davis, appeared in Tom Moldvay’s version of Basic D&D (with a discussion of the differences).
Over time, the Appendix N list has expanded, either with the addition of titles for books where only the author was referenced, the list of books belonging to a series, and books where the influence is so readily apparent that its inclusion seems like an omission. On the other hand, to me, “updated” lists are less of a representation of the influences on D&D and, more specifically, the influences on Gary Gygax when D&D was being created, and are more of a reflection of the tastes of the updater. Though the list may seem somewhat dated, the fact that it’s still a topic of discussion can’t be ignored. In an ENWorld Q&A thread, Gygax said, “The fact is that I wouldn’t change the list much other than to add a couple of novels such as Lanier’s second Hiero yarn, Piers Anthony’s Split Infinity series, and the Disc World books. I would never add other media forms to a reading list. If someone is interested in comic books and or graphic novels, they’re on their own.” (2007)