1. Ahmed, A.K.F., 1998. Financial Prospects of Rail Franchises in Great Britain. M.Sc. Dissertation, Institute for Transport Studies, University of Leeds.
2. Association of Train Operating Companies, 1997. Passenger Demand Forecasting Handbook, third ed. London.
3. Association of Train Operating Companies, 2002. Passenger Demand Forecasting Handbook, fourth ed. London.
4. British Railways Board, 1988. The Effect of Economic Growth on Passenger Gross Revenue. Policy Unit, London.
5. British Railways Board, 1989. Passenger Demand Forecasting Handbook, second ed. Policy Unit, London.