OSE Encounter Activity Tables     Any original/official source
Pathfinder 1e Bestiary 2     Pathfinder original/official source
Pathfinder 1e Bestiary 5     Pathfinder original/official source
Cerulean Seas: Beasts Of The Boundless Blue     Pathfinder original/official source
Mythic Monster Manual v1     Pathfinder original/official source
Scruffy Grognard's Monstrous Manual     D&D 2e (no source link)