Cita APA (7th ed.)

Olaf, E., & Spek, D. v. d. (1988). Chessmen: An attempt to play the game ; 32 photographs / by Erwin Olaf. [Voorwoord: Dirk van der Spek] (1. Auflage.). Focus.

Cita Chicago (17th ed.)

Olaf, Erwin, i Dirk van der Spek. Chessmen: An Attempt to Play the Game ; 32 Photographs / by Erwin Olaf. [Voorwoord: Dirk Van Der Spek]. 1. Auflage. Amsterdam [u.a.]: Focus, 1988.

Cita MLA (8th ed.)

Olaf, Erwin, i Dirk van der Spek. Chessmen: An Attempt to Play the Game ; 32 Photographs / by Erwin Olaf. [Voorwoord: Dirk Van Der Spek]. 1. Auflage. Focus, 1988.