Artikel Jurnal
Horner, David, author
Allen & Unwin, 1998
Buku Teks
Long, Gavin, author
B.T. Batsford, 1969
Buku Teks
Haseman, John B., author
USINDO, 2009
Buku Teks
Dewi Fortuna Anwar, 1958-, author
Centre for Strategic and International Studies, 1992
Buku Teks