Beard, C. A., & Beard, M. R. (1944). A basic history of the United States. New York: New Home Library.
Citazione stile Chigago Style (17a edizione)Beard, Charles A., e Mary R. Beard. A Basic History of the United States. New York: New Home Library, 1944.
Citatione MLA (8a ed.)Beard, Charles A., e Mary R. Beard. A Basic History of the United States. New York: New Home Library, 1944.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.