"Henry N. Russell Definition of Henry N. Russell in the Free Online Encyclopedia." The Free Encyclopedia. Farlex. Web. 22 Feb. 2011. <http://encyclopedia2.thefreedictionary.com/Henry N. Russell>.
"Henry N Russell, Henry N Russell Science Definition | Science Dictionary." Dictionary.com. Ask.com. Web. 22 Feb. 2011. <http://dictionary.reference.com/science/henry n russell>.
Shapley, Harlow. "Henry Norris Russel." National Academy of Sciences (1958). Print.
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