2
   
3
Published: Baden-Baden [u.a.], Gehlen, 1969
   
5
Published: München, Verl. Moderne Industrie, 1967
   
7
Published: Marburg, Metropolis-Verl, 1997
   
12
Published: New York, American Managment Association, 1961
   
13
   
15
Published: Reading, Mass. [u.a.], Addison-Wesley Publ. Co., 1983
   
16
   
20
   

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