Creature Codex (web)     Pathfinder original/official source
Monster Manual Expanded v3     D&D 5e original/official source
Asian Monsters     D&D 5e original/official source
Islands Of Sina Una     D&D 5e (no source link)
Imagine Magazine Monster Collection     AD&D 1e (no source link)
Treatise Of Twisted Terrors     OSRIC original/official source