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Luxembourg: Office for Official Publ. of the European Union, 2010
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Berlin: Liberales Inst., 2006
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Berlin: Liberal Inst., 2006
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Informa UK Limited, 2018
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Informa UK Limited, 2017
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Informa UK Limited, 2015
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Led Edizioni Universitarie, 2014
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Informa UK Limited, 2014
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Informa UK Limited, 2013
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Informa UK Limited, 2013
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Springer Science and Business Media LLC, 2011
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SAGE Publications, 2004
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Informa UK Limited, 2001
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Informa UK Limited, 2001
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Informa UK Limited, 1997
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Informa UK Limited, 1993
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Elsevier BV, 1991
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Informa UK Limited, 1990
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SAGE Publications, 1985
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American Educational Research Association (AERA), 1985