APA (7th ed.) Citation

Werfel, F. V. (1931). The pure in heart. The Book league of America.

Chicago Style (17th ed.) Citation

Werfel, Franz V. The Pure in Heart. New York: The Book league of America, 1931.

MLA (9th ed.) Citation

Werfel, Franz V. The Pure in Heart. The Book league of America, 1931.

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