APA引文

Unger, I., & Unger, D. (1986). These United States: The questions of our past (3rd ed.). Prentice-Hall.

Chicago Style (17th ed.) Citation

Unger, Irwin, and Debi Unger. These United States: The Questions of Our Past. 3rd ed. Englewood Cliffs ,NJ: Prentice-Hall, 1986.

MLA引文

Unger, Irwin, and Debi Unger. These United States: The Questions of Our Past. 3rd ed. Prentice-Hall, 1986.