APA (7th ed.) Citation

Ratzel, F. (2019). Archivmaterialien zu Friedrich Ratzel, 1844-1904.

Chicago Style (17th ed.) Citation

Ratzel, Friedrich. Archivmaterialien Zu Friedrich Ratzel, 1844-1904. 2019.

MLA (8th ed.) Citation

Ratzel, Friedrich. Archivmaterialien Zu Friedrich Ratzel, 1844-1904. 2019.

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