Sources

http://www.middle-ages.org.uk/the-crusades.htm

•http://kpowelleurope.blogspot.com/search?updated-max=2010-11-02T15%3A13%3A00-07%3A00&max-results=7

•http://medievaleurope.mrdonn.org/effects_of_the_crusades.html

•http://www.uwgb.edu/dutchs/westtech/xcrusade.htm

•http://video.answers.com/learn-about-the-explorer-christopher-columbus-304218401

•http://kpowelleurope.blogspot.com/search?updated-max=2010-11-02T15%3A13%3A00-07%3A00&max-results=7

http://www.mapsofworld.com/greece/history/golden-age.html