APA (7th ed.) Zitazioa

Coppa, F. J. (1979). Pope Pius ix: Crusader in a secular age. Twayne.

Chicago Style (17th ed.) Zitazioa

Coppa, Frank J. Pope Pius Ix: Crusader in a Secular Age. Boston: Twayne, 1979.

MLA (9th ed.) Zitazioa

Coppa, Frank J. Pope Pius Ix: Crusader in a Secular Age. Twayne, 1979.