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perseverance of tommas edison
work cited
thomas edison
Edison, Thomas Alva (1847-1931)”the new book of knowledge
“Grolier online, 2012.web30october 2012
Humpier Sandra.
Dare to dream: extramrodina lives.
A
minerst
, New York: penthouse books, 2005.print
Getty images. “American inventor and physicist Thomas Edison.”
Photograph.http://search. Edscohst.com/ longin.aspx. Ebb
cohost’18950101.web11/19/12