APA (7th ed.) Citation

Ellington, H., Addinall, E., & Percival, F. (1986). A handbook of game design. Kogan Page.

Chicago Style (17th ed.) Citation

Ellington, Henry, Eric Addinall, and Fred Percival. A Handbook of Game Design. London [etc.]: Kogan Page, 1986.

MLA (9th ed.) Citation

Ellington, Henry, et al. A Handbook of Game Design. Kogan Page, 1986.