Christoph Clavius Biography Sources

        O'Connor, J.J. and Robertson, E.F. "Christoph Clavius." GAP. December 2008. School of Mathematics and Statistics. September 29, 2010. <http://www.gap-system.org/~history/Biographies/Clavius.html>.


        Müller, Adolf. "Christopher Clavius." The Catholic Encyclopedia. Vol. 4. New York: Robert Appleton Company, 1908. 29 Sept. 2010<http://www.newadvent.org/cathen/04009a.htm>.