Benjamin Franklin, The Way to Wealth (1758). http://www.swarthmore.edu/SocSci/bdorseyl/41docs/52-fra.html.
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Ben Franklin Tercentenary. http://www.benfranklin300.org/exhibit.htm.
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Записка Б.Ч. Форбсу, написанная рукой Томаса Эдисона в 1920 г.; хранится в Собрании Форбса.
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John Stossel and Chris Kilmer, «The Middle Class Is Doing Just Fine, Thank You», ABC 20/20, March 11, 2009. http://abcnews.go.com/2020/Stossel/story?id=7055599&page=l#.T4Hbrr9GijE.
