Pathfinder 2e Bestiary 2     Pathfinder (no source link)
Tome Of Horrors Complete     Pathfinder original/official source
Tome Of Horrors 2018     D&D 5e original/official source
Ultimate Bestiary: Revenge Of The Horde     D&D 5e (no source link)
Monsters Of The Underworld     D&D 5e (no source link)
Monster Manual 3     D&D 3e original/official source