Szarnicki, H. A. (1975). Michael O'Connor, first Catholic bishop of Pittsburgh, 1843-1860: A story of the Catholic pioneers of Pittsburgh and western Pennsylvania (1st. ed.). Wolfson Pub. Co..
Chicago-referens (17:e uppl.)Szarnicki, Henry A. Michael O'Connor, First Catholic Bishop of Pittsburgh, 1843-1860: A Story of the Catholic Pioneers of Pittsburgh and Western Pennsylvania. 1st. ed. Pittsburgh: Wolfson Pub. Co., 1975.
MLA-referens (8:e uppl.)Szarnicki, Henry A. Michael O'Connor, First Catholic Bishop of Pittsburgh, 1843-1860: A Story of the Catholic Pioneers of Pittsburgh and Western Pennsylvania. 1st. ed. Wolfson Pub. Co., 1975.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.