APA (7th ed.) Citation

(1933). Graf-Zeppelin-Kalender. Spemann.

Chicago Style (17th ed.) Citation

Graf-Zeppelin-Kalender. Stuttgart: Spemann, 1933.

MLA (9th ed.) Citation

Graf-Zeppelin-Kalender. Spemann, 1933.

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