APA (7th ed.) Zitazioa

Beard, C. A. (1961). The presidents in american history. Julian Messner.

Chicago Style (17th ed.) Zitazioa

Beard, Charles A. The Presidents in American History. Nueva York: Julian Messner, 1961.

MLA (9th ed.) Zitazioa

Beard, Charles A. The Presidents in American History. Julian Messner, 1961.