APA (7e ed.) Bronvermelding

Zellmer, D. (1999). The spectator: A World War II bomber pilot's journal of the artist as warrior. Praeger.

Chicago (17e ed.) Bronvermelding

Zellmer, David. The Spectator: A World War II Bomber Pilot's Journal of the Artist as Warrior. Westport, Conn.: Praeger, 1999.

MLA (9e ed.) Bronvermelding

Zellmer, David. The Spectator: A World War II Bomber Pilot's Journal of the Artist as Warrior. Praeger, 1999.