Institute International Relations and Area Studies,
Majalah, Jurnal, Buletin
Flora C.I. Chang,
Majalah, Jurnal, Buletin
Europa Publication Limited, 1990
Buku Referensi
Gathorne-Hardy, G.M.
Oxford University Press, 1952
Buku Teks
The H.W. Wilson, 1941
Buku Teks