edited by Eric Oey
APA Publications , 1990
Buku Referensi
Dalton, Bill, author
Odyssey Guides , 1991
Buku Referensi
Bank Bumi Daya
[publisher not identified], 1980
Buku Teks
Institute of Southeast Asian Studies, 1999
Buku Teks
The World Bank, 2004
Buku Teks