Lim, Joo-Jock
Institute of Southeast Asian Studies, 1984
Buku Teks
Puvier, Jan M.
New York : E.J. Brill, 1995,
Buku Referensi
Brandon, Carter, author
The World bank, 1993
Buku Referensi
Association of Academies of Sciences in Asia
Science Press, 2011
eBooks
Vasilyev, D., author
Foreign Languages Publishing House, 1959
Buku Teks