Stirge

The Monsters Know What They're Doing     Dungeons And Dragons original/official source

Angry Golem (web)     D&D 5e original/official source

OSE Encounter Activity Tables     Any original/official source

Pathfinder 1e Bestiary 1     Pathfinder original/official source

All Sorts Of Critters (web)     Pathfinder original/official source

Flee, Mortals     D&D 5e (no source link)

Monster Ecology Anthology     D&D 5e (no source link)

Monster Manual     D&D 4e (no source link)

Dungeons And Dragons Essentials: Monster Vault     D&D 4e (no source link)

MojoBob (web)     D&D 2e original/official source

Scruffy Grognard's Monstrous Manual     D&D 2e (no source link)

13th Age Bestiary     13th Age original/official source

Dragonlance Bestiary     SAGA (no source link)

Lairs And Encounters     Adventurer, Conqueror, King (no source link)