3
Published: Berlin, Bundesinstitut für Berufsbildung, c1980
   
4
   
7
Published: Wilmington, Del., Scholarly Resources, 1986
   
8
Published: Wilmington, Del., Scholarly Resources, 1986
   
9
Published: Berlin, Wissenschaftszentrum, 1983
   
10
   
11
Published: Berlin, Max-Planck-Inst. für Bildungsforschung, Forschungsbereich Bildung, Arbeit und Ges. Entwicklung, 1994
   
16
Published: München-Deisenhofen, Dustri-Verl. Feistle, 2000
   
18
   
19
Published: München, Röhrig, 1942
   
20
   

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