FOLK

Lizardfolk

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

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

Atlas Animalia     Any original/official source

OSE Encounter Activity Tables     Any original/official source

Pathfinder 1e Bestiary 1     Pathfinder original/official source

Monster Codex     Pathfinder original/official source

Classic Monsters Revisited     Pathfinder original/official source

Monster Manual     D&D 5e original/official source

Monster Manual Expanded v1     D&D 5e original/official source

Monster Manual Expanded v2     D&D 5e original/official source

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

Volo's Guide To Monsters     D&D 5e original/official source

Critter Compendium     D&D 5e original/official source

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

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

Monster Manual 2     D&D 4e (no source link)

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

Dragon Magazine Monster Ecologies     D&D 2e/3e (no source link)

Monsters Compendium     Heroes Of Adventure (no source link)

Mystara Adversary Compendium I     Dragon Age original/official source

Baby Bestiary 2     Any original/official source