Παραπομπή σε μορφή APA (7η εκδ.)

Pius, P. C. C. P. (1937). On the religious situation in Mexico, apostolic letter of His Holiness, Pope Pius XI, issued March 28, 1937. Washington, D.C..

Παραπομπή σε μορφή Chicago (17η εκδ.)

Pius, Pope; Catholic Church. Pope. On the Religious Situation in Mexico, Apostolic Letter of His Holiness, Pope Pius XI, Issued March 28, 1937. Washington, D.C., 1937.

Παραπομπή σε μορφή MLA (8th εκδ.)

Pius, Pope; Catholic Church. Pope. On the Religious Situation in Mexico, Apostolic Letter of His Holiness, Pope Pius XI, Issued March 28, 1937. Washington, D.C., 1937.