2Bertrand Renaud, 1991, Affordability, Price-income Ratio and Housing Performance: An International Perspective, Working Paper No. 52 Centre of Urban Planning and Environmental Management, University of Hong Kong.
3World Bank, 2000, World Development Report 1999/2000 :Entering the 21th Century, Oxford University Press: Oxford and New York.
4World Bank, 2001, World Development Indicators 2001,Oxford University Press:Oxford and New York.
