BBC, Rare Michelangelo sketch for sale, Friday, 14 October 2005, [1] accessed: 9 February 2008
fiu.edu
Source: the respective biographical entries on Essay of a General List of Cardinals by Salvador Miranda with corrections provided by Werner Maleczek, Papst und Kardinalskolleg von 1191 bis 1216, Wien 1984 for the period before 1190 until 1254
Another view of the façade statues. From left to right: ① Thaddeus, ② Matthew, ③ Philip, ④ Thomas, ⑤ James the Elder, ⑥ John the Baptist (technically a 'precursor' and not an apostle); ⑦ Christ (centre, the only one with a halo); ⑧ Andrew, ⑨ John the Apostle, ⑩ James the Younger, ⑪ Bartholomew, ⑫ Simon and ⑬ Matthias. («Unofficial architecture site». saintpetersbasilica.org. Վերցված է 2011 թ․ հունիսի 1-ին.)
«St. Peter's - The Nave». Saintpetersbasilica.org. Արխիվացված օրիգինալից 2012 թ․ հուլիսի 16. Վերցված է 2016 թ․ օգոստոսի 9-ին.{{cite web}}: CS1 սպաս․ bot: original URL status unknown (link)