Acta Capitulorum Provincialium, Provinciae Romanae Ordinis Praedicatorum, 1265, n. 12, in Corpus Thomisticum, http://www.corpusthomisticum.org/a65.html Accessed 8 April 2011
Kantorowicz, Ernst H. (December 1944). "The "King's Advent": And The Enigmatic Panels in the Doors of Santa Sabina". The Art Bulletin. 26 (4): 207–231. doi:10.2307/3046963. ISSN0004-3079. JSTOR3046963.
Leith, Mary Joan Winn; Sheckler, Allyson Everingham (January 2010). "The Crucifixion Conundrum and the Santa Sabina Doors*". Harvard Theological Review. 103 (1): 67–88. doi:10.1017/S0017816009990319. ISSN0017-8160. S2CID162503435.
Kantorowicz, Ernst H. (December 1944). "The "King's Advent": And The Enigmatic Panels in the Doors of Santa Sabina". The Art Bulletin. 26 (4): 207–231. doi:10.2307/3046963. ISSN0004-3079. JSTOR3046963.
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curia.op.org
The Order of the Preachers. "General Curia". Retrieved 2009-01-29.
opcentral.org
Pierre Mandonnet, O.P., St. Dominic and His Work, Translated by Sister Mary Benedicta Larkin, O.P., B. Herder Book Co., St. Louis/London, 1948, Chapt. III, [page needed] note 50: "If the installation at Santa Sabina does not date from 1220, at least it is from 1221. The official grant was made only in June, 1222 (Bullarium O.P., I, 15). But the terms of the bull show that there had been a concession earlier. Before that concession the Pope said that the friars had no hospitium in Rome. At that time St. Sixtus was no longer theirs; Conrad of Metz could not have alluded to St. Sixtus, therefore, when he said in 1221: "the Pope has conferred on them a house in Rome" (Laurent no. 136). It is possible that the Pope was waiting for the completion of the building that he was having done at Santa Sabina, before giving the title to the property, on June 5, 1222, to the new Master of the Order, elected not many days before." http://opcentral.org/resources/2012/08/23/years-of-experimental-activity-1215-19/ Accessed 2016-2-27.
Leith, Mary Joan Winn; Sheckler, Allyson Everingham (January 2010). "The Crucifixion Conundrum and the Santa Sabina Doors*". Harvard Theological Review. 103 (1): 67–88. doi:10.1017/S0017816009990319. ISSN0017-8160. S2CID162503435.
Kantorowicz, Ernst H. (December 1944). "The "King's Advent": And The Enigmatic Panels in the Doors of Santa Sabina". The Art Bulletin. 26 (4): 207–231. doi:10.2307/3046963. ISSN0004-3079. JSTOR3046963.
Leith, Mary Joan Winn; Sheckler, Allyson Everingham (January 2010). "The Crucifixion Conundrum and the Santa Sabina Doors*". Harvard Theological Review. 103 (1): 67–88. doi:10.1017/S0017816009990319. ISSN0017-8160. S2CID162503435.