Sanaa : Tofauti kati ya masahihisho

==Viungo vya nje==

* {{cite encyclopedia |last1=Cowan |first1=Tyler |authorlink=Tyler Cowan |editor= [[David R. Henderson]] (ed.) |encyclopedia=[[Concise Encyclopedia of Economics]] |title=Arts |url=http://www.econlib.org/library/Enc/Arts.html |year=2008 |edition= 2nd |publisher=[[Library of Economics and Liberty]] |location=Indianapolis |isbn=978-0865976658 |oclc=237794267}} – A look at how general economic principles govern the arts.

 

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