Citazione Stile APA (7a Edizione)

Nichols, J. P. (1943). Twentieth century United States: A history. D. Appleton-Century.

Citazione stile Chigago Style (17a edizione)

Nichols, Jeanette Paddok. Twentieth Century United States: A History. New York: D. Appleton-Century, 1943.

Citatione MLA (9a ed.)

Nichols, Jeanette Paddok. Twentieth Century United States: A History. D. Appleton-Century, 1943.