Complete Guide to Phantasy Star III: Contains walkthroughs, enemy lists, maps, script, game bugs, codes, fan fiction, wallpaper, music, and emulation downloads.
GameFAQs: Contains walkthrough, guide, and player reviews.
GameWinners.com: Contains codes and FAQs.
Mike's RPG Center: Manuals: Contains text-only version of the game manual.
Phantasy Star III Unofficial: Contains artwork, a FAQ, and character information by the game's character designer.
RPGamer.com: Includes walkthrough, MIDIs, and artwork.
RPGClassics.com: Contains character, item, technique, and enemy lists, maps, and a walkthrough.