Open University Press, 1998
Buku Teks
Williams, Norma
Tiger Books International, 1990
Buku Referensi
Saltman, Deborah, author
Harcourt Brace Jovanovich, 1991
Buku Teks
Springer Publishing Company, 2017
Buku Teks
Priwitzer, Kerstin, author
Institute of South East Asia Studies, 2012
eBooks