Cita APA

Singer, K. (1945). Spies and traitors of world war II. Prentice-Hall.

Citación estilo Chicago

Singer, Kurt. Spies and Traitors of World War II. New York: Prentice-Hall, 1945.

Cita MLA

Singer, Kurt. Spies and Traitors of World War II. Prentice-Hall, 1945.