The Monsters Know What They're Doing Dungeons And Dragons original/official source
Monstrosities Swords & Wizardry original/official source
Angry Golem (web) D&D 5e original/official source
Pathfinder 1e Bestiary 2 Pathfinder original/official source
Pathfinder 2e Bestiary 1 Pathfinder original/official source
Forgotten Foes Pathfinder original/official source
Monster Manual D&D 5e original/official source
D&D 2e Monstrous Manual D&D 2e original/official source
Scruffy Grognard's Monstrous Manual D&D 2e (no source link)
Mystara Adversary Compendium I Dragon Age original/official source
The Atlantean Bestiary Any original/official source