"James Edward Keeler - Wikipedia, the free encyclopedia." Wikipedia, the free encyclopedia. N.p., n.d. Web. 27 Feb. 2011. <http://en.wikipedia.org/wiki/James_Edward_Keeler>
Walsh, Glenn . "Discoverer of Composition of Saturn's Rings: Astronomer James E. Keeler of Allegheny Observatory, Pittsburgh." Astronomer John Brashear of Allegheny Observatory, Pittsburgh. N.p., n.d. Web. 27 Feb. 2011. <http://johnbrashear.tripod.com/bio/KeelerJ.htm>
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