1. "Arthur Henderson." BrainyQuote.com. Xplore Inc, 2013. 17 February 2013. <http://www.brainyquote.com/quotes/quotes/a/arthurhend199076.html>.
2. "Helmut Jahn." BrainyQuote.com. Xplore Inc, 2013. 17 February 2013. <http://www.brainyquote.com/quotes/quotes/h/helmutjahn325251.html>.
2. "Helmut Jahn." BrainyQuote.com. Xplore Inc, 2013. 17 February 2013. <http://www.brainyquote.com/quotes/quotes/h/helmutjahn325251.html>.