John Paul II, P. (1987). Unity in the work of service. National Conference of Catholic Bishops, United States Catholic Conferences.
Chicago-referens (17:e uppl.)John Paul II, Pope. Unity in the Work of Service. Washington, D.C.: National Conference of Catholic Bishops, United States Catholic Conferences, 1987.
MLA-referens (8:e uppl.)John Paul II, Pope. Unity in the Work of Service. National Conference of Catholic Bishops, United States Catholic Conferences, 1987.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.