Παραπομπή σε μορφή APA (7η εκδ.)

Catholic Church. Pope (1922-1939 : Pius XI) & Pius XI, P. Why a retreat?: "Mens nostra," the encyclical of Pope Pius XI on Laymen's retreats. Paulist Press.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Catholic Church. Pope (1922-1939 : Pius XI) και Pope Pius XI. Why a Retreat?: "Mens Nostra," the Encyclical of Pope Pius XI on Laymen's Retreats. New York: Paulist Press.

Παραπομπή σε μορφή MLA (8th εκδ.)

Catholic Church. Pope (1922-1939 : Pius XI) και Pope Pius XI. Why a Retreat?: "Mens Nostra," the Encyclical of Pope Pius XI on Laymen's Retreats. Paulist Press.