Survey of Text Mining_ II_ Clustering Classification and Retrieval_ Michael W Berry_ Malu Castellanos_ 2007.pdf
       Text Mining_ Applications and Theory_ Michael W Berry_ Jacob Kogan_ 2010.pdf
       Text Mining_ Classification Clustering and Applications_ Ashok Srivastava_ Mehran Sahami_ 2009.pdf
       The Text Mining Handbook_ Advanced Approaches in Analyzing Unstructured Data_ Ronen Feldman_ James Sanger_ 2006.pdf