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Det Kgl. Bibliotek/Royal Danish Library, 1959
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SAGE Publications, 1959
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SAGE Publications, 1959
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Det Kgl. Bibliotek/Royal Danish Library, 1960
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SAGE Publications, 1958
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Oxford University Press (OUP), 1991
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SAGE Publications, 1968
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JSTOR, 1970
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JSTOR, 1967
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Oxford University Press (OUP), 1966
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Det Kgl. Bibliotek/Royal Danish Library, 1958
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Ithaca: Cornell University Press, 1989 ; [S.l.]: HathiTrust Digital Library, 2010