https://en.wikipedia.org/wiki/Daniel_Hale_Williamshttp://sharenews.com/dr-daniel-hale-williams-pioneered-open-heart-surgery/
http://www.biography.com/people/daniel-hale-williams-9532269#!
http://inventors.about.com/od/blackinventors/p/Daniel_Williams.htm
http://newsone.com/2024415/daniel-hale-williams/
http://www.pbs.org/wgbh/amex/partners/early/e_pioneers_williams.html
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