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Neukirchen-Vluyn: Neukirchener Verl. des Erziehungsvereins, 1995
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Genève: Droz, 1979
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Longman Group Ltd., 1991
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Oxford University Press (OUP), 1991
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PERSEE Program, 1983
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PERSEE Program, 1980
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PERSEE Program, 1980
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JSTOR, 1998
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JSTOR, 1981
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JSTOR, 1981
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JSTOR, 1969
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JSTOR, 1983
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JSTOR, 1973
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JSTOR, 1970
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PERSEE Program, 1982