Nightingale, Virginia
Routledge, 1996
Buku Teks SO
Morley, David, 1964-
Routledge, 1992
Buku Teks SO
Artikel Jurnal
London : Hamish Hamilton Ltd
Majalah, Jurnal, Buletin
Amin Sweeney
Center for South and Southeast Asia Studies. University of California, 1980
Buku Teks SO