APA (7th ed.) Citation

Ferm, V. T. A. (1948). Religion in the twentieth century. Philosophical Library.

Chicago Style (17th ed.) Citation

Ferm, Vergilius Ture Anselm. Religion in the Twentieth Century. New York: Philosophical Library, 1948.

MLA (9th ed.) Citation

Ferm, Vergilius Ture Anselm. Religion in the Twentieth Century. Philosophical Library, 1948.