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 1     Pathfinder original/official source
Mythic Monster Manual v1     Pathfinder original/official source
All Sorts Of Critters (web)     Pathfinder original/official source
Flee, Mortals     D&D 5e (no source link)
Monster Monday (web)     D&D 5e original/official source
Monster Ecology Anthology     D&D 5e (no source link)
Monster Manual     D&D 4e (no source link)
Liber Bestarius     D&D 3e original/official source