APA (7th ed.) Citation

Keller, H. (1965). Wallraf-Richartz-Museum Köln.

Chicago Style (17th ed.) Citation

Keller, Horst. Wallraf-Richartz-Museum Köln. 1965.

MLA (9th ed.) Citation

Keller, Horst. Wallraf-Richartz-Museum Köln. 1965.

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