Minstry Foreign Affairs, [date of publication not identified]
Buku Teks
by J. Swiericzuk ... [and others]
Pitman, 1980
Buku Teks SO
by J. Swiericzuk ... [and others]
Pitman, 1980
Buku Teks SO
Evans, Gareth, 1944-
Melbourne University Press, 1991
Buku Teks SO
Millar, T.B.
Australian Nationsl University Press, 1978
Buku Teks SO