Naga

Dracopedia Bestiary: An Artist's Guide     Any original/official source

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

Pathfinder 1e Bestiary 1     Pathfinder original/official source

Pathfinder 2e Bestiary 1     Pathfinder original/official source

Pathfinder 2e Bestiary 2     Pathfinder original/official source

Monster Manual     D&D 5e original/official source

Monster Manual Expanded v3     D&D 5e original/official source

Asian Monsters     D&D 5e original/official source

Critter Compendium     D&D 5e original/official source

Monsters Of The Underworld     D&D 5e original/official source

Monster Ecology Anthology     D&D 5e (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)

Monster Guide     World Of Warcraft RPG original/official source

The Monster Overhaul     OSR (no source link)

Dungeon Fantasy Monsters 2     GURPS 4e original/official source

Baby Bestiary 2     Any original/official source