Pius XII, P. (1940). The family front: 50th anniversary of Rerum novarum, June 1, 1941. Catholic Worker Press.
Chicago-referens (17:e uppl.)Pius XII, Pope. The Family Front: 50th Anniversary of Rerum Novarum, June 1, 1941. Chicago: Catholic Worker Press, 1940.
MLA-referens (8:e uppl.)Pius XII, Pope. The Family Front: 50th Anniversary of Rerum Novarum, June 1, 1941. Catholic Worker Press, 1940.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.