Department of External Affairs, 1963
Buku Teks
Soward, F.H., author
Oxford University Press, 1950
Buku Teks
engle, Eloise
The John Day Company, 1963
Buku Teks
Chao, Wu, author
Kluwer Law International, 1996
Buku Teks
Handy, Willowdean C.
Australian National University Press,, 1973
Buku Teks