Παραπομπή σε μορφή APA (7η εκδ.)

Pius, P. C. C. P. (1932). Encyclical Letter of His Holiness, Pope Pius XI. Washington, D.C..

Παραπομπή σε μορφή Chicago (17η εκδ.)

Pius, Pope; Catholic Church. Pope. Encyclical Letter of His Holiness, Pope Pius XI. Washington, D.C., 1932.

Παραπομπή σε μορφή MLA (8th εκδ.)

Pius, Pope; Catholic Church. Pope. Encyclical Letter of His Holiness, Pope Pius XI. Washington, D.C., 1932.