APA (7th ed.) Citation

Spengler, O., & Atkinson, C. F. (1939). The decline of the West. A. A. Knopf.

Chicago Style (17th ed.) Citation

Spengler, Oswald, and Charles Francis Atkinson. The Decline of the West. New York: A. A. Knopf, 1939.

MLA (9th ed.) Citation

Spengler, Oswald, and Charles Francis Atkinson. The Decline of the West. A. A. Knopf, 1939.