1.
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New York, McGraw-Hill [1967]
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2.
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New York, McGraw-Hill [1970]
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3.
|
New York, McGraw-Hill [c1969]
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4.
|
New York : McGraw-Hill, c1959-1987.
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5.
|
New York, McGraw-Hill, 1950.
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6.
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Washington, D.C. : World Bank, c2009.
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7.
|
New York, Holt, Rinehart and Winston [1963]
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