Sharp, J.T., author
Chapman and Hall, 1989
Buku Teks
Zubrick, James W., author
John Wiley & Sons, 2001
Buku Teks
Bance, S.
Ellis Horwood, 1980
Buku Referensi
Cooper, James W., author
John Wiley & Sons, 1980
Buku Teks
Pasto, Daniel J., author
[Publisher not identified], 1992
Buku Teks