Singapore : Institute of Southeast Asian Studies
Majalah, Jurnal, Buletin
Seidler, Lee J., author
[publisher not identified], 1975
Buku Teks
May, Tim, author
Open University Press, 2001
Buku Teks
edited by Raymond Cochrane and Douglas Carrol
Falmer Press, 1991
Buku Teks
edited by Rosalind S. Miller, and Helen Rehr
Prentice-Hall, 1983
Buku Teks