Pathfinder 1e Bestiary 2 Pathfinder (no source link)
Monsters Of The Underworld D&D 5e original/official source
Monstrous Manual: Dragonlance D&D 2e (no source link)
Scruffy Grognard's Monstrous Manual D&D 2e (no source link)
Hacklopedia Of Beasts Hackmaster (no source link)
Monsters Compendium Heroes Of Adventure (no source link)
The Monster Overhaul OSR (no source link)
Lairs And Encounters Adventurer, Conqueror, King (no source link)