Cita APA

Heffner, R. D., & Heffner, R. D. (1965). A documentary history of the United States (6. ed.). New York, New York: New American Library.

Citación estilo Chicago

Heffner, Richard D., y Richard D. Heffner. A Documentary History of the United States. 6. ed. New York, New York: New American Library, 1965.

Cita MLA

Heffner, Richard D., y Richard D. Heffner. A Documentary History of the United States. 6. ed. New York, New York: New American Library, 1965.