Minstry Foreign Affairs, [date of publication not identified]
Buku Teks
by J. Swiericzuk ... [and others]
Pitman, 1980
Buku Teks
Millar, T.B.
Australian Nationsl University Press, 1978
Buku Teks
Fernandez, Alejandro M.
NSDB-UP Integrated Research Program, 1977
Buku Teks
Aroru, BD
Asian Educational service, 0
Buku Teks