In Pace, E. A. (1922). The Catholic encyclopedia: An international work of reference on the constitution, doctrine, discipline and history of the Catholic Church. New York: Encyclopedia Press. 501
unsw.edu.au
web.maths.unsw.edu.au
Franklin , J., "The Renaissance myth", Quadrant 26 (11) (Nov, 1982), 51-60. (Retrieved on-line at 06-07-2007)