APA (7th ed.) Citation

Guardini, R. (1940). Der Widersacher. Christliche Besinnung.

Chicago Style (17th ed.) Citation

Guardini, Romano. "Der Widersacher." Christliche Besinnung 1940.

MLA (9th ed.) Citation

Guardini, Romano. "Der Widersacher." Christliche Besinnung, 1940.

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