APA (7th ed.) Citation

Freidel, F. (1970). America in the twentieth century (3d ed.). Knopf.

Chicago Style (17th ed.) Citation

Freidel, Frank. America in the Twentieth Century. 3d ed. New York: Knopf, 1970.

MLA (9th ed.) Citation

Freidel, Frank. America in the Twentieth Century. 3d ed. Knopf, 1970.