APA (7th ed.) Citation

Bouillard, H. (1957). Karl Barth. Karl Barth.

Chicago Style (17th ed.) Citation

Bouillard, Henri. "Karl Barth." Karl Barth 1957.

MLA (8th ed.) Citation

Bouillard, Henri. "Karl Barth." Karl Barth, 1957.

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