Shapiro, Alan C., author
Prentice-Hall, 1998
Buku Teks
Manser, W.A.P.
Cassell/Associated Business Programmes, 1973
Buku Teks
Levi, Maurice D., 1945-, author
McGraw-Hill, 1990
Buku Teks
Eitman, David K., author
Perason, 2001
Buku Teks
Eiteman, David K., author
Mass Addison-Wesley , 1992
Buku Teks