Cerasani, E. Da Sulmona all'Aquila con Celestino V, 1986 p. opp. t.p. (Pietro Celestino) p. 7 (fra Pietro del Morrone) p. 11 (Pietro Angeleri; b. Sant'Angelo di Limosano, near Isernia, 1215) p. 53 (Pietro da Morrone) p. 91 (Pier Celestino)
Enc. amer., 1975 (Celestine V; 1215-1296)
Enc. brit., 1972 (Celestine V)
Gurgo, O. Celestino V, c1982 (subj.) t.p. (Celestino V)
Italian Wikipedia, viewed Mar. 1, 2013 (Celestino V; b. Pietro Angelerio (or Angeleri, according to some sources), between 1209-1215, Molise (traditionally, Isernia and Sant'Angelo di Limosano [both in Molise] have claimed his birth); called Pietro del Morrone; d. May 19, 1296, Fumone; elected Pope, July 5, 1294; crowned, Aug. 29, 1294; resigned, Dec. 13, 1294)
New Catholic encyclopedia (Celestine V, Pope, St.; b. Peter of Morrone, 1215, Isernia; d. May 19, 1296, Castello di Fumone; elected Pope, July 5, 1294; consecrated, Aug. 27, 1294; crowned two days later; resigned Dec. 13, 1294; canonized, May 5, 1313)
Vita del beatissimo confessore Pietro Angelerio, 1995.