Pathfinder 1e Bestiary 1     Pathfinder original/official source
Tome Of Horrors Complete     Pathfinder original/official source
Fifth Edition Foes     D&D 5e original/official source
Tome Of Horrors 2018     D&D 5e original/official source
Monster Manual 3     D&D 3e original/official source
Adventures Dark And Deep     Adventures Dark And Deep (no source link)