APA (7th ed.) Citation

(1920). Kölner Universitäts-Kalender. Müller.

Chicago Style (17th ed.) Citation

Kölner Universitäts-Kalender. Köln: Müller, 1920.

MLA (8th ed.) Citation

Kölner Universitäts-Kalender. Müller, 1920.

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