Neckers, Douglas C.
      
      
         John Wiley & Sons, 1977
       Buku Teks
   
McMurry, John
      
      
         Brooks/Cole, 2007
       Buku Teks
   
Boxer, Robert J.
      
      
         McGraw-Hill, 1998
       Buku Referensi
   
Solomons, T.W. Graham
      
      
         John Wliley & Sons , 2011
       Buku Teks SO
   
Morrison, Robert Thornton
      
      
         Prentice-Hall, 1992
       Buku Teks