Cita APA

Unger, I. 1., & Unger, D. (1978). These United States: The questions of our past. Boston: Little, Brown and Company.

Citación estilo Chicago

Unger, Irwin 1927-, y Debi Unger. These United States: The Questions of Our Past. Boston: Little, Brown and Company, 1978.

Cita MLA

Unger, Irwin 1927-, y Debi Unger. These United States: The Questions of Our Past. Boston: Little, Brown and Company, 1978.