Game level design : game development essentials.

MLA

Castillo, Travis, and Jeannie Novak. Game Level Design : Game Development Essentials. New York: Delmar Cengage Learning, 2008.

APA

Castillo, T., & Novak, J. (2008). Game level design : game development essentials. New York: Delmar Cengage Learning.

Chicago

Castillo, Travis, and Jeannie Novak. Game Level Design: Game Development Essentials. New York: Delmar Cengage Learning, 2008.