The Monsters Know What They're Doing Dungeons And Dragons original/official source
Angry Golem (web) D&D 5e original/official source
Creature Chronicle (web) Pathfinder original/official source
Monster Manual D&D 5e original/official source
Monster Ecology Anthology D&D 5e (no source link)
Dark Sun Creature Catalog D&D 4e 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)
AD&D Fiend Folio AD&D 1e (no source link)
Dragonlance Bestiary SAGA (no source link)