Monstrosities     Swords & Wizardry original/official source
Angry Golem (web)     D&D 5e original/official source
Tome Of Horrors Complete     Pathfinder original/official source
Monster Manual 2     D&D 4e (no source link)
QUERP Bestiary     QUERP original/official source
Adventures Dark And Deep     Adventures Dark And Deep (no source link)