APA (7th ed.) Citation

Mendel, A. P. (1964). The twentieth century, 1914-1964. Free Press.

Chicago Style (17th ed.) Citation

Mendel, Arthur P. The Twentieth Century, 1914-1964. New York: Free Press, 1964.

MLA (8th ed.) Citation

Mendel, Arthur P. The Twentieth Century, 1914-1964. Free Press, 1964.