"ClerkMaxwell, James." A Dictionary of Astronomy. 1997. Encyclopedia.com. 26 Dec. 2009 <http://www.encyclopedia.com>.
"ClerkMaxwell, James." A Dictionary of Astronomy. 1997. Encyclopedia.com. (December 26, 2009). http://www.encyclopedia.com/doc/1O80-ClerkMaxwellJames.html
"ClerkMaxwell, James." A Dictionary of Astronomy. 1997. Retrieved December 26, 2009 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O80-ClerkMaxwellJames.html