APA (7th ed.) Citation

Thils, G., & Marlé, R. (1968). Christianisme sans religion? Casterman.

Chicago Style (17th ed.) Citation

Thils, Gustave, and René Marlé. Christianisme Sans Religion? Tournai: Casterman, 1968.

MLA (9th ed.) Citation

Thils, Gustave, and René Marlé. Christianisme Sans Religion? Casterman, 1968.

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