APA (7th ed.) Citation

Helmus, T. M. (1982). The United States and its neighbors. Silver Burdett Co..

Chicago Style (17th ed.) Citation

Helmus, Timothy M. The United States and Its Neighbors. Morristown, N.J.: Silver Burdett Co., 1982.

MLA (9th ed.) Citation

Helmus, Timothy M. The United States and Its Neighbors. Silver Burdett Co., 1982.