1. The Practice and callenges of solid waste management in Singapore;Bai;Waste Manage.,2002
2. Chongqing Municipal Administration Committee, 1997. Environmental Sanitary Plan for Chongqing’s Main districts. Chongqing, China.
3. Chongqing Environmental Protection Bureau, 2001. Environmental Communiqué of Chongqing 2002. Chongqing, China.
4. Chongqing Municipality Government, 2000, Legislations of the Municipal Solid wastes’ disposal fees in Chongqing Main districts. Government of Chongqing Municipality 2000/79. Chongqing, China.
5. A comparison of waste management in Guangzhou and Hong Kong;Chung;Resources, Conserv. Recycling,1998