APA (7th ed.) Citation

Spengler, O. (1962). The decline of the west (1st American ed.). Knopf.

Chicago Style (17th ed.) Citation

Spengler, Oswald. The Decline of the West. 1st American ed. New York: Knopf, 1962.

MLA (9th ed.) Citation

Spengler, Oswald. The Decline of the West. 1st American ed. Knopf, 1962.