The Monsters Know What They're Doing     Dungeons And Dragons original/official source
Pathfinder 1e Bestiary 2     Pathfinder original/official source
Pathfinder 2e Bestiary 1     Pathfinder original/official source
Tome Of Horrors Complete     Pathfinder original/official source
Scruffy Grognard's Monstrous Manual     D&D 2e (no source link)
Dragonlance Bestiary     SAGA (no source link)