Colin Camerer, «Behavioral economics: Reunifying psychology and economics,» Proceedings of the National Academy of Sciences, Vol. 96, September 1999.
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Bruno S. Frey, Not Just for the Money: An Economic Theory of Personal Motivation (Edward Elgar Publishing, 1997), p. 118–119. См. также: Bruno S. Frey & Alois Stutzer, Happiness & Economics (Princeton University Press, 2002).