JAMES STEVENS CURL. "mullion." A Dictionary of Architecture and Landscape Architecture. 2000. Encyclopedia.com. 9 Feb. 2010 <http://www.encyclopedia.com>.
JAMES STEVENS CURL. "mullion." A Dictionary of Architecture and Landscape Architecture. 2000. Encyclopedia.com. (February 9, 2010). http://www.encyclopedia.com/doc/1O1-mullion.html
JAMES STEVENS CURL. "mullion." A Dictionary of Architecture and Landscape Architecture. 2000. Retrieved February 09, 2010 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O1-mullion.html