Gaya APA

Vries, P, P, D. (1973). Discernment of spirits according to the life and teachings of St. Ignatius of Loyola. Transl. by W. Dudok van Heel. : Ignatius of de Spiritualiteit der Jezuiten. . New York: Exposition Press.

Gaya MLA

Vries, Piet, Penning, De. "Discernment of spirits according to the life and teachings of St. Ignatius of Loyola. Transl. by W. Dudok van Heel. : Ignatius of de Spiritualiteit der Jezuiten. ". New York: Exposition Press, 1973. Buku.