Varian, Hal (1997). "What Use Is Economic Theory?" in A. D'Autume and J. Cartelier, ed., Is Economics Becoming a Hard Science?, Edward Elgar. Pre-publication PDF.Archived 2006년 6월 25일 - 웨이백 머신 Retrieved 2008-04-01.
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Varian, Hal (1997). "What Use Is Economic Theory?" in A. D'Autume and J. Cartelier, ed., Is Economics Becoming a Hard Science?, Edward Elgar. Pre-publication PDF.Archived 2006년 6월 25일 - 웨이백 머신 Retrieved 2008-04-01.