http://islam.about.com/b/2003/12/09/crescent-moon-symbol.htm
Dome of the mihrab in the Mosque-Cathedral of Córdoba, Spain.
Córdoba, Mosque-Cathedral of: dome of the mihrab. Photograph. Encyclopedia Britannica. Web. 6 Feb. 2013. <http://www.school.eb.com.proxygsu-sput.galileo.usg.edu/eb/art-123716>.