General reference
These materials might be useful for general reference:
- The Official Doom FAQ
- ClassicDOOM.com
- The Unofficial DOOM Specs
- The Page of Doom at Doomworld.com
- Lee Killough's Doom pages
- The Doom Legacy Wiki — note that this is not GFDL, and material from the Legacy Wiki should not be copied into the Doom Wiki
GFDL resources
The following may be copied directly to this wiki:
- Doom-related articles on Wikipedia — note however that many of these contain information or wording that is unnecessary in this context
- The ZDoom documentation project
- The Chocolate Doom website
- Eternity Wiki
- Vavoom Site
- Doomsday Engine Site