APA (7th ed.) Citation

Wirth, G. (1969). Heinrich Böll. Union-Verlag.

Chicago Style (17th ed.) Citation

Wirth, Günter. Heinrich Böll. Berlin: Union-Verlag, 1969.

MLA (8th ed.) Citation

Wirth, Günter. Heinrich Böll. Union-Verlag, 1969.

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