APA-referens (7:e uppl.)

Kettner, F. (1936). The need for a secretary of peace. Biosophical Institute.

Chicago-referens (17:e uppl.)

Kettner, Frederick. The Need for a Secretary of Peace. New York, N.Y.: Biosophical Institute, 1936.

MLA-referens (8:e uppl.)

Kettner, Frederick. The Need for a Secretary of Peace. Biosophical Institute, 1936.