Agostino Oldoini (1676). Augustini Oldoini Athenaeum Romanum (in Latin) (Rome ed.). Perugia: Heredes Sebastiani Zechini. p. 380.: habitusque sui aevi Iurisconsultorum Princeps.
Ferdinand Gregorovius (1902). History of the City of Rome in the Middle Ages. Vol. VIII, part 1. London: G. Bell & sons. pp. 46–52. Gregorovius (p. 47) names Cardinal Cibò of Tusculum as the Vicar. But Cibò had never been Bishop of Tusculum, rather of Palestrina, and he died in 1503. The name of the one cardinal left behind is given by the Diario of Marino Sanuto, Volume VI (Venezia 1881), pp. 389, 395.
Umberto Benassi (1899). Storia di Parma: 1501-1512 (in Italian). Vol. primo. Parma: M. Adorni di L. Battei. p. 191.
Ken Pennington, "The Development of Feudal Law in the Ius commune," in the article, "Law, Feudal," Dictionary of the Middle Ages: Supplement 1 (New York: Charles Scribner's Sons-Thompson-Gale, 2004), pp. 320-323. "Archived copy". Archived from the original on 2007-11-11. Retrieved 2016-02-07.{{cite web}}: CS1 maint: archived copy as title (link)
Ken Pennington, "The Development of Feudal Law in the Ius commune," in the article, "Law, Feudal," Dictionary of the Middle Ages: Supplement 1 (New York: Charles Scribner's Sons-Thompson-Gale, 2004), pp. 320-323. "Archived copy". Archived from the original on 2007-11-11. Retrieved 2016-02-07.{{cite web}}: CS1 maint: archived copy as title (link)
