1
Published: Berlin, Volk und Wissen, 1965
   
3
Published: Bad Heilbrunn/Obb., Klinkhardt, 1957
   
7
Published: Fulda, Verl.anst, 1989
   
8
Published: Berlin, Max-Planck-Institut für Bildungsforschung, 1992
   
11
   
12
Published: Tampere, Tampereen Yliopisto, 1969
   
14
Published: Jyväskylä, Jyväskylän Yliopisto, 1990
   
16
   
20
Published: Chicago, Ill., Rand McNally, 1973
   

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