1. Brown F. (1995). “Traffic and revenues: risk minimization.” Proc. Conf. on Transport Infrastructure Asia '95 Institute for International Research Hong Kong.
2. Halcrow Fox. (1994). Route 3—country park section: traffic and revenue forecasts. Hong Kong.
3. Highway Planning and Design Institute Ministry of Communication China. (1993). “Proposed Zhuhai Neilingding Crossing: review of traffic volume projection.” Preliminary Feasibility Study Report. China.
4. May A. Milne D. Smith M. Ghali M. and Wisten M. (1995). “A comparison of the performance of alternative road pricing systems.” Proc. 7th World Conf. on Transport Res. Vol. 3: Transport Policy. 335–346.