APA (7th ed.) Citation

Degn, C., Dietrich, F. M., & Sroka, L. (1957). Deutschland. Hirt.

Chicago Style (17th ed.) Citation

Degn, Christian, F. M. Dietrich, and Ludwig Sroka. Deutschland. Kiel: Hirt, 1957.

MLA (9th ed.) Citation

Degn, Christian, et al. Deutschland. Hirt, 1957.