Coppa, F. J. (1979). Pope Pius ix: Crusader in a secular age. Twayne.
Chicagoスタイル(17版)引用形式Coppa, Frank J. Pope Pius Ix: Crusader in a Secular Age. Boston: Twayne, 1979.
MLA(9版)引用形式Coppa, Frank J. Pope Pius Ix: Crusader in a Secular Age. Twayne, 1979.
警告: この引用は必ずしも正確ではありません.