APA (7th ed.) Citation

Taft, W. H., Marburg, T., & Flack, H. E. (1920). Taft papers on League of Nations. Macmillan.

Chicago Style (17th ed.) Citation

Taft, William H., Theodore Marburg, and Horace E. Flack. Taft Papers on League of Nations. New York: Macmillan, 1920.

MLA (9th ed.) Citation

Taft, William H., et al. Taft Papers on League of Nations. Macmillan, 1920.