Campbell, J. M. (1894). Biographical Sketch of Hon. James Campbell Postmaster General of the United States, 1853-1857. Records of the Catholic Historical Society of Philadelphia. Volume V. No.3. Pages 265-303. Philadelphia : American Catholic Historical Society of Philadelphia.
Chicago-referens (17:e uppl.)Campbell, John M. Biographical Sketch of Hon. James Campbell Postmaster General of the United States, 1853-1857. Records of the Catholic Historical Society of Philadelphia. Volume V. No.3. Pages 265-303. Philadelphia : American Catholic Historical Society of Philadelphia, 1894.
MLA-referens (8:e uppl.)Campbell, John M. Biographical Sketch of Hon. James Campbell Postmaster General of the United States, 1853-1857. Records of the Catholic Historical Society of Philadelphia. Volume V. No.3. Pages 265-303. Philadelphia : American Catholic Historical Society of Philadelphia, 1894.