Whitney, D. C., & Whitney, R. V. (1990). The American presidents (7th ed.). Prentice Hall Press.
Chicagoスタイル(17版)引用形式Whitney, David C., , Robin Vaughn Whitney. The American Presidents. 7th ed. New York: Prentice Hall Press, 1990.
MLA(9版)引用形式Whitney, David C., , Robin Vaughn Whitney. The American Presidents. 7th ed. Prentice Hall Press, 1990.
警告: この引用は必ずしも正確ではありません.