edited by Svend Dahl and H.G. Topsae-Jensen; translated by W. Glyn Jones
      
         Berlingske Bogtr, 1955
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Ackerman, Robert
      
      
         Cambridge University Press , 1990
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Moscow Foreign Languages Publishing House 1959
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Makarenko, A.S.
      
      
         Foreign Languages Publishing House, 1920
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Enan, M.A.
      
      
         Ashraf, 1946
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