APA (7th ed.) Citation

Colton, J. (1968). Twentieth century. Time-Life Books.

Chicago Style (17th ed.) Citation

Colton, Joel. Twentieth Century. New York: Time-Life Books, 1968.

MLA (9th ed.) Citation

Colton, Joel. Twentieth Century. Time-Life Books, 1968.

Warning: These citations may not always be 100% accurate.