Artikel Jurnal
Gilbert, Neil, author
Prentice-Hall, 1977
Buku Teks
Hao Xiaoming; Sunanda K. Datta-Ray
Marshall Cavendish, 2006
Buku Teks
edited by Derek Johnson and Mark Valenciaand"
ISEAS, 2005
Buku Teks
Danico, Mary Yu, author
Greenwood Press, 2004
Buku Teks