Cortada, James W., author
McGraw-Hill, 1994
Buku Referensi
Bank, John, author
Prentice-Hall, 2000
Buku Teks
Fandy Tjiptono, author
Andi Offset, 1996
Buku Teks
Strategic Direction Publishers, [date of publication not identified]
Buku Referensi
Strategic Direction Publishers, [date of publication not identified]
Buku Referensi