APA-referens (7:e uppl.)

Birnbaum, K. E. (1958). Peace moves and U-boat warfare: A study of Imperial Germany's policy towards the United States, April 18, 1916-January 9, 1917. Almqvist & Wiksell.

Chicago-referens (17:e uppl.)

Birnbaum, Karl E. Peace Moves and U-boat Warfare: A Study of Imperial Germany's Policy Towards the United States, April 18, 1916-January 9, 1917. Stockholm: Almqvist & Wiksell, 1958.

MLA-referens (8:e uppl.)

Birnbaum, Karl E. Peace Moves and U-boat Warfare: A Study of Imperial Germany's Policy Towards the United States, April 18, 1916-January 9, 1917. Almqvist & Wiksell, 1958.