APA (7th ed.) Citation

Dubofsky, M., Theoharis, A. G., & Smith, D. M. (1978). The United States in the twentieth century. Prentice-Hall.

Chicago Style (17th ed.) Citation

Dubofsky, Melvyn, Athan G. Theoharis, and Daniel Malloy Smith. The United States in the Twentieth Century. Englewood Cliffs, N.J.: Prentice-Hall, 1978.

MLA (9th ed.) Citation

Dubofsky, Melvyn, et al. The United States in the Twentieth Century. Prentice-Hall, 1978.