APA (7th ed.) Citation

Ratzel, F. Archivmaterialien zu Friedrich Ratzel, 1844-1904.

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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

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