Angry Golem (web)     D&D 5e original/official source
Pathfinder 1e Bestiary 1     Pathfinder original/official source
Pathfinder 2e Bestiary 2     Pathfinder (no source link)
Tome Of Horrors Complete     Pathfinder (no source link)
Demons Revisited     Pathfinder original/official source
Tome Of Horrors 2020     D&D 5e original/official source
Encyclopedia Of Lifeforms Mundane And Magical     D&D 3e (no source link)