Pandey, Carol, author
Thomson, 2003
Buku Teks
Akester, Patricia, author
Sweet & Maxwell, 2008
Buku Referensi
Schott judith, author
Elsevier Science , 2005
Buku Teks
Raffel, Markus, author
Springer, 1998
Buku Teks
Edwards, Martin B., author
Kogan Page, 1991
Buku Teks