3
   
4
   
5
Published: Frankfurt a.M, Peter Lang GmbH, Internationaler Verlag der Wissenschaften, 2019
   
7
Published: Tutzing, Hans Schneider, 1997
   
16
Published: Frankfurt am Main [u.a.], Diesterweg [u.a.], 1980
   
17
Published: Hamburg, Verl. d. Ges. d. Freunde d. vaterländ. Schul- u. Erziehungswesens, 1950
   
20
   

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