APA (7th ed.) Citation

Butler, N. M., & Marshall, E. (1915). The United States as a world power. [publisher not identified].

Chicago Style (17th ed.) Citation

Butler, Nicholas Murray, and Edward Marshall. The United States as a World Power. [New York? N.Y.]: [publisher not identified], 1915.

MLA (9th ed.) Citation

Butler, Nicholas Murray, and Edward Marshall. The United States as a World Power. [publisher not identified], 1915.