7
   
9
   
11
Published: Langensalza [u.a.], Beltz, 1930
   
19
Published: Wiesbaden, VS Verlag für Sozialwissenschaften | GWV Fachverlage GmbH, Wiesbaden, 2007
   
20
Published: Frankfurt/Main [u.a.], Campus-Verl., 1995
   

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