1.
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New Haven, Yale University Press, 1955.
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2.
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New York : Plenum Press, c1993.
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3.
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New York, Holt, Rinehart and Winston [1961]
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4.
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Boston, Beacon Press [1960]
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5.
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Westport, Conn., Greenwood Press [1975]
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6.
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Garden City, N.Y., Doubleday, 1958.
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7.
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Cambridge, Mass., Addison-Wesley Pub. Co., 1954.
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8.
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New York, Social Science Research Council [1942]
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