APA (7th ed.) Citation

Verein "Alt-Köln" e.V & Bayer, D. J. (1921). Alt-Köln-Kalender 1922. Paul Gehly.

Chicago Style (17th ed.) Citation

Verein "Alt-Köln" e.V and Dr. Josef Bayer. Alt-Köln-Kalender 1922. Köln: Paul Gehly, 1921.

MLA (8th ed.) Citation

Verein "Alt-Köln" e.V and Dr. Josef Bayer. Alt-Köln-Kalender 1922. Paul Gehly, 1921.

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