APA (7th ed.) Zitazioa

Sweeney, E. J. (2007). The Pyramid Age. Algora Pub..

Chicago Style (17th ed.) Zitazioa

Sweeney, Emmet John. The Pyramid Age. New York: Algora Pub., 2007.

MLA (9th ed.) Zitazioa

Sweeney, Emmet John. The Pyramid Age. Algora Pub., 2007.