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              Held, D. (2006) Models of democracy, 3 rd edn. Polity, Cambridge, UK, Malden, MA. Helfferich, C. (2009) Die Qualität qualitativer Daten: Manual für die Durchführung qualitativer Interviews, 3 rd edn. VS Verlag für Sozialwissenschaften/GWV Fachverlage GmbH, Wiesbaden, Wiesbaden.
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              Held, D. (2006). Models of democracy. Cambridge: Polity Press.
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              Held, D. (2006): Models of Democracy. Stanford: Stanford University Press.
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              Held, D., Helfferich, M. A., C. (2006). Models of Democracy. Polity, Cambridge, UK, Malden: VS Verlag für Sozialwissenschaften/GWV Fachverlage GmbH. Polity.
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