Citazione Stile APA (7a Edizione)

Unger, I., & Unger, D. (1978). These United States: The questions of our past. Little, Brown.

Citazione stile Chigago Style (17a edizione)

Unger, Irwin, e Debi Unger. These United States: The Questions of Our Past. Boston: Little, Brown, 1978.

Citatione MLA (8a ed.)

Unger, Irwin, e Debi Unger. These United States: The Questions of Our Past. Little, Brown, 1978.