Ratzinger. The Unity of the Nations. The Catholic University of America Press.
Citazione stile Chigago Style (17a edizione)Ratzinger. The Unity of the Nations. The Catholic University of America Press.
Citatione MLA (9a ed.)Ratzinger. The Unity of the Nations. The Catholic University of America Press.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.