The Monsters Know What They're Doing     Dungeons And Dragons original/official source
Atlas Animalia     Any original/official source
Pathfinder 2e Bestiary 1     Pathfinder original/official source
All Sorts Of Critters (web)     Pathfinder original/official source
Monster Manual     D&D 5e original/official source
Fizban's Treasury Of Dragons     D&D 5e original/official source
Monster Ecology Anthology     D&D 5e (no source link)
Encyclopedia Of Lifeforms Mundane And Magical     D&D 3e (no source link)
Scruffy Grognard's Monstrous Manual     D&D 2e (no source link)