APA (7th ed.) Citation

Mayer, G. H., & Forster, W. O. (1958). The United States and the twentieth century. Houghton Mifflin.

Chicago Style (17th ed.) Citation

Mayer, George H., and Walter O. Forster. The United States and the Twentieth Century. Boston: Houghton Mifflin, 1958.

MLA (9th ed.) Citation

Mayer, George H., and Walter O. Forster. The United States and the Twentieth Century. Houghton Mifflin, 1958.