Willebrord Snell Sources

O'Connor, J. J., and E. F. Robertson. "Willebrord Van Royen Snell." Snell Biography. N.p., n.d. Web. 10 Sept. 2014. <http://www-history.mcs.st-and.ac.uk/Biographies/Snell.html>.

"Snel (Snellius or Snel van Royen), Willebrord." Complete Dictionary of Scientific Biography. Vol. 12. Detroit: Charles Scribner's Sons, 2008. 499-502. Gale Virtual Reference Library. Web. 10 Sept. 2014. <http://go.galegroup.com/ps/i.do?id=GALE%7CCX2830904066&v=2.1&u=fl_sarhs&it=r&p=GVRL&sw=w&asid=8bd327844e3d79defe085de8edae3c82>.

Norton, Stephen D. "Willebrord Snell." Science and Its Times. Ed. Neil Schlager and Josh Lauer. Vol. 3: 1450 to 1699. Detroit: Gale, 2001. 383-384. Gale Virtual Reference Library. Web. 10 Sept. 2014. <http://go.galegroup.com/ps/i.do?id=GALE%7CCX3408501397&v=2.1&u=fl_sarhs&it=r&p=GVRL&sw=w&asid=b93f88b3d05caa002f85ccbb64652ebe>.