Unity Game Development Essentials by Goldstone, Will

GameMaker Essentials by Auckett, Nathan

GameMaker Essentials by Nathan Aukett - Tutorial Book on Game Maker Studio

Unity Game Development Essentials - Paperback By Goldstone, Will - GOOD

Game Development Essentials: Game - Paperback, by Ahlquist Jr. John - Acceptable

Game Development Essentials: An Introduction by Novak, Jeannie

Game Development Essentials Second Edition by Jeannie Novak Textbook