Cita APA (7th ed.)
Goebeler, H. J., & Vanzo, J. P. (2008). Steel boats, iron hearts: A U-boat crewman's life aboard U-505 (1st trade pbk. ed.). Savas Beatie.
Cita Chicago (17th ed.)
Goebeler, Hans Jacob, i John P. Vanzo. Steel Boats, Iron Hearts: A U-boat Crewman's Life Aboard U-505. 1st trade pbk. ed. New York: Savas Beatie, 2008.
Cita MLA (9th ed.)
Goebeler, Hans Jacob, i John P. Vanzo. Steel Boats, Iron Hearts: A U-boat Crewman's Life Aboard U-505. 1st trade pbk. ed. Savas Beatie, 2008.
Atenció: Aquestes cites poden no estar 100% correctes.