Citazione Stile APA (7a Edizione)

Heffner, R. D. (1956). A documentary History of the united states. The New American Library.

Citazione stile Chigago Style (17a edizione)

Heffner, Richard D. A Documentary History of the United States. New York: The New American Library, 1956.

Citatione MLA (9a ed.)

Heffner, Richard D. A Documentary History of the United States. The New American Library, 1956.