APA (7th ed.) Citation

Schellenberg, W., & Hagen, L. (1958). Hitler's secret service. Pyramid Books.

Chicago Style (17th ed.) Citation

Schellenberg, Walter, and Louis Hagen. Hitler's Secret Service. New York: Pyramid Books, 1958.

MLA (9th ed.) Citation

Schellenberg, Walter, and Louis Hagen. Hitler's Secret Service. Pyramid Books, 1958.