Medalla Elliott Cresson: diferència entre les revisions

<ref name="bio">The Franklin Institute. Donors of the Medals and their histories. [http://www.fi.edu/learn/case-files/bell/cresson_bio.pdf ''The Elliott Cresson Medal - Founded in 1848 - Gold Medal'']. Consultat on July 13Juliol, 2009.</ref>

<ref name="facts">The Franklin Institute. Awards. [http://www.fi.edu/franklinawards/about.html ''About the Awards: History and Facts''], Consultat on July 13Juliol, 2009.</ref>

<ref name="winners">The Franklin Institute. Winners. [http://www.fi.edu/winners/show_results.faw?gs=&ln=&fn=&keyword=&subject=&award=CRESS&sy=&ey=&max=300&name=Submit ''Cresson Medal winners'']. Consultat on July 13Juliol, 2009.</ref>