APA (7th ed.) Citation

Engel, E., & Hoppenheit, K. (1935). Bismarck. Union Dt. Verl.-Ges.

Chicago Style (17th ed.) Citation

Engel, E., and K. Hoppenheit. Bismarck. Berlin: Union Dt. Verl.-Ges, 1935.

MLA (9th ed.) Citation

Engel, E., and K. Hoppenheit. Bismarck. Union Dt. Verl.-Ges, 1935.

Warning: These citations may not always be 100% accurate.