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Canadian Encyclopedia. 02 Apr. 2013
< http://www.thecanadianencyclopedia.com/featured/the-discovery-of-insulin>.
Nagengast, Bernard. Refrigeration and Air Conditioning in the 20th Century. 2000.
The American Society Of Mechanical Engineers. 2 Apr. 2013
< http://www.lcs.syr.edu/faculty/khalifa/MAE554/Refrigeration
History.PDF>.
"Washing Machine." Washing Machine. 02 Apr. 2013
< http://web.bryant.edu/~ehu/h364proj/sprg_99/cox/wash_mach.htm>.
Misty, Brighton. "What is a Candlestick Telephone." wiseGEEK. N.p., 02 Apr 2013. Web. 2
Apr 2013. <http://www.wisegeek.com/what-is-a-candlestick-telephone.htm#>
"Coin Telephones." bobsoldphones. N.p.. Web. 2 Apr 2013
<http://www.bobsoldphones.net/Pages/AustPostOffice/Payphones.htm>
"Radio in the 1920s." Virginia. N.p., 0 Apr 2013. Web. 3 Apr 2013.
<http://xroads.virginia.edu/~ug00/3on1/radioshow/1920radio.htm
"1920-1960 Television." Imagining the Internet. N.p., 03 Apr 2013. Web. 3 Apr
2013. <http://www.elon.edu/e-web/predictions/150/1930.xhtml>
Ament, Phill. "Vacuum Cleaner." The Great Idea Finder. N.p., 03 Apr 2013. Web. 3 Apr
2013.<http://www.ideafinder.com/history/inventions/vacleaner.htm>