APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (8e ed.) Bronvermelding

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