State Statistical Bureau. 1991. China Statistical Yearbook 1991. Beijing: China Statistical Publishing House.
Technical Supervision Bureau and Construction Department of China. 1995. Code for Transport Planning on Urban Road. January 14.
Tiwari, G. 2002. Urban Transport for Growing Cities, High Capacity Bus Systems. Delhi: Macmillan.
World Bank. 2001. World Development Indicators 2001. Washington, D.C.: World Bank.
Wu, F., and A. G-O Yeh. 1999. Urban spatial structure in a transitional economy: The case of Guangzhou, China. Journal of the American Planning Association 65(autumn):377–394.