1
   
2
   
3
Published: Frankfurt am Main, Europ. Verl.-Anst., 1964-
   
5
   
7
Published: Köln, Max-Planck-Institut für Gesellschaftsforschung, 2011
   
8
Published: Bielefeld, Bertelsmann, [2008-2012]
   
19
Published: Nürnberg, Inst. für Arbeitsmarkt- und Berufsforschung, 2011
   
20
Published: 2009-
   

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