APA引文

Whitney, D. C., & Whitney, R. V. (1990). The American presidents (7th ed.). Prentice Hall Press.

Chicago Style (17th ed.) Citation

Whitney, David C., and Robin Vaughn Whitney. The American Presidents. 7th ed. New York: Prentice Hall Press, 1990.

MLA引文

Whitney, David C., and Robin Vaughn Whitney. The American Presidents. 7th ed. Prentice Hall Press, 1990.