APA (7th ed.) Citation

Dreikurs, R. (1946). The challenge of marriage. Duell.

Chicago Style (17th ed.) Citation

Dreikurs, Rudolf. The Challenge of Marriage. New York: Duell, 1946.

MLA (9th ed.) Citation

Dreikurs, Rudolf. The Challenge of Marriage. Duell, 1946.

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