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2. Singapore's second national communication. Under the United Nations framework convention on climate change;NEA,2010
3. Report on the Household Expenditure Survey 2007/08, Singapore;Department of Statistics,2009
4. Montreal Protocol On Substances that Deplete the Ozone Layer: 2006 assessment report of the Technology and Economic Assessment Panel;United Nations Environment Programme (UNEP),2007
5. 2nd Green Building Masterplan;BCA,2009