References
1. de Blij, H.J. (2000) Geography: Realms, Regions, and Concepts (Ninth Edition). New York: John Wiley & Sons, Inc.
2. Bradshaw, Michael. (1997) World Regional Geography. Brown & Benchmark publishers. McGraw Hill Companies, Inc.
3. World Population Data Sheet. (2001) Population Reference Bureau.
4. http://www.britannica.com [May 23, 2001]