APA (7th ed.) Citation

Köhnen, R. (2017). Werner Heldt: 1904-1954.

Chicago Style (17th ed.) Citation

Köhnen, Ralph. Werner Heldt: 1904-1954. Berlin, 2017.

MLA (8th ed.) Citation

Köhnen, Ralph. Werner Heldt: 1904-1954. 2017.

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