"Husayn ibn Ali." The Columbia Encyclopedia, Sixth Edition. 2008. Encyclopedia.com. 10 Jul. 2009 <http://www.encyclopedia.com>.
"Husayn ibn Ali." The Columbia Encyclopedia, Sixth Edition. 2008. Encyclopedia.com. (July 10, 2009). http://www.encyclopedia.com/doc/1E1-Husaynib.html
"Husayn ibn Ali." The Columbia Encyclopedia, Sixth Edition. 2008. Retrieved July 10, 2009 from Encyclopedia.com: http://www.encyclopedia.com/doc/1E1-Husaynib.html