Gaya APA

Cowan, M, &, F, J, C. (1982). The Spiritual Exercises of St. Ignatius of Loyola: A handbook for directors. . Cambridge: Cambridge Jesuit Educational Center.

Gaya MLA

Cowan, Marian, &, Futrell,, John, Carroll. "The Spiritual Exercises of St. Ignatius of Loyola: A handbook for directors. ". Cambridge: Cambridge Jesuit Educational Center, 1982. Buku.