APA (7th ed.) Citation

Unger, I., & Unger, D. (1992). These United States: The questions of our past (5th ed., Combined ed.). Prentice Hall.

Chicago Style (17th ed.) Citation

Unger, Irwin, and Debi Unger. These United States: The Questions of Our Past. 5th ed., Combined ed. Englewood Cliffs, N.J.: Prentice Hall, 1992.

MLA (9th ed.) Citation

Unger, Irwin, and Debi Unger. These United States: The Questions of Our Past. 5th ed., Combined ed. Prentice Hall, 1992.