O'Callaghan, J. F. (2004). The O Callaghan family of County Cork: A history. Irish Family Names.
Chicago Style (17th ed.) CitationO'Callaghan, Joseph F. The O Callaghan Family of County Cork: A History. Dublin: Irish Family Names, 2004.
MLA (9th ed.) CitationO'Callaghan, Joseph F. The O Callaghan Family of County Cork: A History. Irish Family Names, 2004.
Warning: These citations may not always be 100% accurate.