Artz F. B. The mind of the Middle Ages, A.D. 200-1500 : an historical survey / Frederick B. Artz. - 3d ed., revised. - Chicago [a. o.] : University of Chicago Press, 1991. - XIII, 586 p.. URL: http://www.loc.gov/catdir/description/uchi052/79016259.html. URL: http://www.loc.gov/catdir/enhancements/fy0608/79016259-t.html