James Cook University of North Queensland
James Cook University, 1993
Buku Referensi
Masters, Gilbert M., author
Prentice-Hall, 2008
Buku Teks
Masters, Gilbert M., author
Prentice-Hall, 2008
Buku Teks
Glynn, Henry J., author
Prentice-Hall, 1996
Buku Teks
Sawyer, Clair N., author
McGraw-Hill, 2003
Buku Teks