Call of Cthulhu Rpg Keeper Rulebook: Horror Roleplaying in the Worlds of H.p. Lovecraft (Call of Cthulhu Roleplaying): Chaosium Inc, Sandy Petersen, Lynn Willis, Mike Mason, Paul Fricker, Alan Bligh, Matthew Sanderson,
Call of Cthulhu RPG: Coming From D&D | Noble Knight Gaming Hall
Malleus Monstrorum - Cthulhu Mythos Bestiary - PDF - Chaosium Inc.
RPGnet: Review of Malleus Monstrorum Vol. I + II (Printable Version)