Minstry Foreign Affairs, [date of publication not identified]
Buku Teks
A.K.P. Mochtan, editor
Centre for Strategic and International Studies, 1992
Buku Teks
Southeast Asia Development Advisory Group of the Asia Society, 1970
Buku Teks
Caroline Hughes, Kheang Un, editor
Nias Press, 2011
Buku Teks
Page, Max
University of Chicago Press , 1999
Buku Teks