Monstrosities     Swords & Wizardry original/official source
Pathfinder 1e Bestiary 3     Pathfinder original/official source
Mythic Monster Manual v2     Pathfinder original/official source
Mythic Egypt     Pathfinder original/official source
Hacklopedia Of Beasts     Hackmaster (no source link)
Baby Bestiary 1     Any original/official source