Crum, Leonard William
National Bureau of Economic Research , 1942
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Murphy, Henry C., author
McGraw-Hill, 1950
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Buchanan, A. Russell, author
Harper & Row, Publishing, 1964
Buku Teks
Buchanan, A. Russell, author
Harper & Row, [c1964]
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Smith, Daniel M., author
John Wiley & Sons, 1965
Buku Teks