APA (7th ed.) Citation

Baader, G., & Geffcken, J. (1964). Karl Heinrich Johannes Geffcken (2.5.1861-11.6.1935).

Chicago Style (17th ed.) Citation

Baader, Gerhard, and Johannes Geffcken. Karl Heinrich Johannes Geffcken (2.5.1861-11.6.1935). 1964.

MLA (9th ed.) Citation

Baader, Gerhard, and Johannes Geffcken. Karl Heinrich Johannes Geffcken (2.5.1861-11.6.1935). 1964.

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