HOWELL, The Lives of St. Francis of Assisi, by Brother Thomas of Celano, I (London, 1908), 24; ROBINSON, Life of St. Clare, ascribed to Thomas of Celano (Philadelphia, 1910), 22 sq.; IDEM, A Short Introduction to Franciscan Literature (New York, 1907), 7-9; DUBOIS, Thomas of Celano, The Historian of St. Francis, in Cath. Univ. Bulletin, XIII, no. 2 (April, 1907), 250-268; D'ALENCON, S. Francisci Assisensis: vita et miracula, additis opusculis liturgicis, auctore Fr. Thoma de Celano, IX (Rome, 1906), 22: BARLATI, Tommaso da Celano e le sue opere (Casalbordino, 1894); Analecta Boll., XVIII, 81-176; WADDING, Script. Min., 323; SHARALEA, Supplem. ad script. min., 672-74.