APA (7th ed.) Citation

Ratzel, F. (1888). Völkerkunde. Völkerkunde.

Chicago Style (17th ed.) Citation

Ratzel, Friedrich. "Völkerkunde." Völkerkunde 1888.

MLA (8th ed.) Citation

Ratzel, Friedrich. "Völkerkunde." Völkerkunde, 1888.

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