Applebaum, Wilbur. "Severin, Christian (Christen Sorenson; Longomontanus or Langberg)."Encyclopedia of the Scientific Revolution: From Copernicus to Newton. N.p.: Garland Science, 2000. N. pag. Print.
"Christian Longomontanus (Danish Astronomer)." Encyclopedia Britannica Online. Encyclopedia Britannica, n.d. Web. http://www.britannica.com/EBchecked/topic/347617/Christian-Longomontanus.
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