APA (7th ed.) Citation

Poetter, J., & Hengesbach, R. (1991). Günter Umberg.

Chicago Style (17th ed.) Citation

Poetter, Jochen, and Rolf Hengesbach. Günter Umberg. Baden-Baden, 1991.

MLA (8th ed.) Citation

Poetter, Jochen, and Rolf Hengesbach. Günter Umberg. 1991.

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