4
Published: Bad Honnef, Bock, 1978
   
5
Published: St. Gallen, Sekretariat des Schweizerischen Inst. für Verwaltungskurse, 1995
   
6
   
7
Published: Bonn-Bad Godesberg, Dokumentationsabt. der Westdt. Rektorenkonferenz, 1980
   
9
Published: Frankfurt am Main, Klostermann, 1969-1976
   
11
Published: Bad Honnef, Bock, 2003
   
13
   
15
   
16
Published: Bonn, Westdt. Rektorenkonferenz, 1990
   
17
   
19
Published: Berlin, Volk und Wissen, 1989
   
20
   

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