Sarmento, Anabela, author
IRM Press, 2005
Buku Teks
Academic Press, 1985
Buku Teks
Faulkner, Christine, author
Prentice-Hall, 1998
Buku Teks
Cheung, Theresa, author
Hachette Book Group, 2008
Buku Teks
Goddard, Ken, author
The Bath Press, 1995
Buku Teks