Player - The Doom Wiki at
Nightmare spectre - The Doom Wiki at
Doom I Enhanced - PCGamingWiki PCGW - bugs, fixes, crashes, mods
Doom II - Wikipedia
Cyberdemon (Doom 64), Doom Wiki
Hacks - Doom 64: Complete Edition
Doom 64, Doom Wiki
Doom 64, Doom Wiki
Doom 64, Doom Wiki