ISBN 978-0-631-22637-6* Frieder, Braden K. "Chivalry & the perfect prince: tournaments, art, and armor at the Spanish Habsburg court" Truman State University, 2008 ISBN 1-931112-69-X, ISBN 978-1-931112-69-7* Grierson, Philip "Medieval European Coinage" Cambridge University Press, 2007 ISBN 0-521-03177-X, ISBN 978-0-521-03177-6* Mack, Rosamond E. Bazaar to Piazza: Islamic Trade and Italian Art, 1300–1600, University of California Press, 2001 ISBN 0-520-22131-1, google books* Matthew, Donald, "The Norman kingdom of Sicily" Cambridge University Press, 1992 ISBN 978-0-521-26911-7
ISBN 978-0-631-22637-6* Frieder, Braden K. "Chivalry & the perfect prince: tournaments, art, and armor at the Spanish Habsburg court" Truman State University, 2008 ISBN 1-931112-69-X, ISBN 978-1-931112-69-7* Grierson, Philip "Medieval European Coinage" Cambridge University Press, 2007 ISBN 0-521-03177-X, ISBN 978-0-521-03177-6* Mack, Rosamond E. Bazaar to Piazza: Islamic Trade and Italian Art, 1300–1600, University of California Press, 2001 ISBN 0-520-22131-1, google books* Matthew, Donald, "The Norman kingdom of Sicily" Cambridge University Press, 1992 ISBN 978-0-521-26911-7==External links==* Islamic Contributions to the West by Rachida El Diwani, Professor of Comparative Literature.