Haag, Stephen, author
Irwin McGraw-Hill, 1998
Buku Referensi
Lucas, Henry C., author
McGraw-Hill, 1981
Buku Teks
Murdick, Robert G., author
Prentice-Hall, 1984
Buku Teks
McLeod, Raymond, author
Prentice-Hall, 2001
Buku Teks
Dickson, Gary W., author
McGraw-Hill, 1985
Buku Teks