W.H. Freeman and Company, 2002
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Campbell, Mary K.
      
      
         Brooks/Cole Cengage Learning, 2008
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Mathews, Christopher K.
      
      
         Addison-Wesley, 2000
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Glick, David
      
      
         Appleton & lange , 1995
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Rastogi, S.C.
      
      
         Tata McGraw-Hill, 1995
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