Whitney, D. C., & Whitney, R. V. (1990). The American presidents (7th ed.). Prentice Hall Press.
Lua i Stíl Chicago (17ú heag.)Whitney, David C., agus Robin Vaughn Whitney. The American Presidents. 7th ed. New York: Prentice Hall Press, 1990.
Lua MLA (9ú heag.)Whitney, David C., agus Robin Vaughn Whitney. The American Presidents. 7th ed. Prentice Hall Press, 1990.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.