Walsh, Katherine (1 January 1997). "Bishop John O'Corcoran of Clogher (1373–1389) at the University of Prague, the Purgatorium Sancti Patricii and the Debate about Purgatory in the Later Middle Ages". Clogher Record. 16 (1): 7–36. doi:10.2307/27699413. JSTOR27699413.
jstor.org
Walsh, Katherine (1 January 1997). "Bishop John O'Corcoran of Clogher (1373–1389) at the University of Prague, the Purgatorium Sancti Patricii and the Debate about Purgatory in the Later Middle Ages". Clogher Record. 16 (1): 7–36. doi:10.2307/27699413. JSTOR27699413.
