MLA

Beard, Charles A, and Mary R Beard. A Basic History of the United States. New York: New Home Library, 1944.

APA

Beard, C. A, & Beard, M. R. (1944). A basic history of the United States. New York: New Home Library.

Chicago

Beard, Charles A., and Mary R Beard. A Basic History of the United States. New York: New Home Library, 1944.