APA (7th ed.) Citation

Ratzel, F. (1894). Völkerkunde Völkerkunde.

Chicago Style (17th ed.) Citation

Ratzel, Friedrich. "Völkerkunde." Völkerkunde 1894.

MLA (9th ed.) Citation

Ratzel, Friedrich. "Völkerkunde." Völkerkunde, 1894.

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