Biography Source Citations: Longomontanus

"Longomontanus." Science and Its Times. Ed. Neil Schlager and Josh Lauer. Vol. 3: 1450 to 1699. Detroit: Gale, 2001. 394. Gale Virtual Reference Library. Web. 18 Sept. 2014.

"Severin, Christian." Complete Dictionary of Scientific Biography. Vol. 12. Detroit: Charles Scribner's Sons, 2008. 332.Gale Virtual Reference Library. Web. 18 Sept. 2014.