Willebrord Snel Works Cited

Works Cited

Davidson, Michael W. "Willebrord Snell (1580-1626)." Molecular Expressions. Florida State University, 17 Oct. 2004. Web. 15 Oct. 2010. http://www.molecularexpressions.com/optics/timeline/people/snell.html.

Norton, Stephen D. "Willebrord Snell." BookRags.com. Thomson Corporation, 2005. Web. 14 Oct. 2010. http://www-history.mcs.st-and.ac.uk/Biographies/Snell.html.

School of Mathematics and Statistics. "Willebrord Van Royen Snell." MacTutor History of Mathematics. University of St Andrews, Scotland, Dec. 1996. Web. 15 Oct. 2010. http://www.bookrags.com/research/willebrord-snell-scit-031234/.

Struik, Dirk Jan (1970–80). "Snel, Willebrord". Dictionary of Scientific Biography. XII. New York: Charles Scribner's Sons. ISBN 0684101149.