Gaya APA

Principles of Christian morality, by Heinz Schürmann, Joseph Ratzinger & H.Urs von Balthasar, trans.by Graham Horrison. : Priczipien Christlicher Moral. 1975. . (1986). San Francisco: Ignatius Press.

Gaya MLA

Principles of Christian morality, by Heinz Schürmann, Joseph Ratzinger & H.Urs von Balthasar, trans.by Graham Horrison. : Priczipien Christlicher Moral. 1975. . . San Francisco: Ignatius Press, 1986. Buku.