APA (7th ed.) Citation

Sutley, Z. T. (1930). The last frontier. Macmillan.

Chicago Style (17th ed.) Citation

Sutley, Zachary Taylor. The Last Frontier. New York: Macmillan, 1930.

MLA (9th ed.) Citation

Sutley, Zachary Taylor. The Last Frontier. Macmillan, 1930.