Cita APA (7th ed.)

Whitney, D. C., & Whitney, R. V. (1996). The American presidents (8th ed.). Reader's Digest.

Cita Chicago (17th ed.)

Whitney, David C., i Robin Vaughn Whitney. The American Presidents. 8th ed. Pleasantville, N.Y: Reader's Digest, 1996.

Cita MLA (9th ed.)

Whitney, David C., i Robin Vaughn Whitney. The American Presidents. 8th ed. Reader's Digest, 1996.