The Monsters Know What They're Doing     Dungeons And Dragons original/official source
Pathfinder 1e Bestiary 1     Pathfinder original/official source
Dungeon Denizens Revisited     Pathfinder original/official source
Monster Ecology Anthology     D&D 5e (no source link)
Monster Manual 3     D&D 4e (no source link)
D&D 2e Monstrous Manual     D&D 2e (no source link)
Scruffy Grognard's Monstrous Manual     D&D 2e (no source link)
AD&D Monster Manual     AD&D 1e (no source link)
Adventures Dark And Deep     Adventures Dark And Deep (no source link)