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added Category:美國人 using HotCat
* {{cite web |title=Buchholz on Competition, Stress, and the Rat Race |url=http://www.econtalk.org/archives/_featuring/todd_buchholz/ |work=EconTalk |publisher=Library of Economics and Liberty |
author=Russ Roberts |date= 2011-06-13}}
[[Category:美國人]]