Smith, Dan Throop
Boston Harvard University 1952,
Buku Teks
Smith, Dan Throop
National Bureau of Economic Research Inc. , 1949
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Copeland, Thomas E., author
Addison-Wesley, 1983
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Copeland, Thomas E., author
Addison-Wesley, 2005
Buku Teks
Butters, J. Keith
Harvard University Press , 1951
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