Artikel Jurnal
CAMBRIDGE UNIVERSITY PRESS,
Majalah, Jurnal, Buletin
London: A Whitehall Overseas Pub., 1991,
Buku Referensi
Hao Xiaoming; Sunanda K. Datta-Ray
Marshall Cavendish, 2006
Buku Teks
Edited by John A. Lent
The Iowa State University Press, 1971
Buku Teks