APA (7th ed.) Citation

Strong, G. T., Nevins, A., & Thomas, M. H. (1952). Diary. Macmillan.

Chicago Style (17th ed.) Citation

Strong, George Templeton, Allan Nevins, and Milton Halsey Thomas. Diary. New York: Macmillan, 1952.

MLA (9th ed.) Citation

Strong, George Templeton, et al. Diary. Macmillan, 1952.