Friday, February 18, 2011

Sources for Ejnar Hertzsprung

Works Cited
"Ejnar Hertzsprung." Wikipedia, the Free Encyclopedia. Web. 18 Feb. 2011. <http://en.wikipedia.org/wiki/Ejnar_Hertzsprung>.
Herrmann, D. B. Ejnar Hertzsprung :. 1981. Print.
"Hertzsprung." RUNDETAARN. Web. 18 Feb. 2011. <http://www.rundetaarn.dk/engelsk/observatorium/hertz.html>.
"The Sun: Man's Friend & Foe - Hertzsprung." Thinquest. Web. 18 Feb. 2011. <http://library.thinkquest.org/15215/History/hertzsprung.html>.
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