The Dushkin, 1985
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       Artikel Jurnal
   
Easton, Thomas, 1944-2014
      
      
         McGraw-Hill Higher Education, 2008
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Paciorek, Karen Menke
      
      
         McGraw-Hill, Higher Education, 2008
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      Edited Kurt Finsterbusch and George Mckenna
      
         Dushkin Publishing Group, 1986
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