edited by Walt Boyes
Butterworth-Heinemann, 2003
Buku Referensi
Wolf, Stanley, author
Prentice-Hall, 1990
Buku Referensi
Bagchi, S. N., author
Wiley Eastern, 1979
Buku Teks
edited by Edward H. Smith
Butterworth-Heinemann, 1995
Buku Teks
Artikel Jurnal