Westview Press, 1989
Buku Teks
Hubbard, G. E., author
International Secretariat Institute of Pasific Relations , 1943
Buku Teks
Sellman, Roger Raymond, author
Edward Arnold, 1954
Buku Referensi
by the Economist Intelligence Unit and the Cartographic Dept. of the Clarendon Press
Oxford University Press, 1956
Buku Referensi
Linebarger, Paul Myron Anthony, 1913-1966, author
York D van Nostrand, 1954
Buku Teks