^"State", pp. 512–3 in Penguin Dictionary of International Relations. Evans, Graham & Newnham, Jeffrey. 1998. (ISBN 0-14-051397-3). London: Penguin Books Ltd.
来源
Geographica-The Complete Illustrated World Reference (1999), Random House Australia/Periplus, ISBN 962-593-622-X
Financial Times World Desk Reference, 5th Edition (2003), Dorling Kindersley, UK , ISBN 0-7513-4889-9