Cita APA (7a ed.)

Schaefer, H. J., & Monsarrat, N. (1966). U-Boat 977. Ballantine.

Cita Chicago Style (17a ed.)

Schaefer, Heinz J., y Nicholas Monsarrat. U-Boat 977. New York: Ballantine, 1966.

Cita MLA (9a ed.)

Schaefer, Heinz J., y Nicholas Monsarrat. U-Boat 977. Ballantine, 1966.