APA (7th ed.) Citation

Spengler, O., Atkinson, C. F., Helps, A., & Werner, H. (1962). The decline of the West ([1st American ed.].). Knopf.

Chicago Style (17th ed.) Citation

Spengler, Oswald, Charles Francis Atkinson, Arthur Helps, and Helmut Werner. The Decline of the West. [1st American ed.]. New York: Knopf, 1962.

MLA (9th ed.) Citation

Spengler, Oswald, et al. The Decline of the West. [1st American ed.]. Knopf, 1962.