Willging, E. P. (1949). The Index to Catholic pamphlets in the English language. Catholic University of America Press.
Chicago-referens (17:e uppl.)Willging, Eugene P. The Index to Catholic Pamphlets in the English Language. Washington, D.C.: Catholic University of America Press, 1949.
MLA-referens (8:e uppl.)Willging, Eugene P. The Index to Catholic Pamphlets in the English Language. Catholic University of America Press, 1949.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.