1. Balcombe RJ, Hopkin JM & Perrett KE (1988) Bus deregulation in Great Britain: a review of the first year. Transport and Road Research Laboratory Report 161, Crowthorne, Berkshire.
2. Baumol WJ, Panzar JC & Willig RD (1988) Contestable Markets and the Theory of Industrial Structure, (revised). Brace Jovanovich. New York: Harcourt.
3. Department of Transport (1984) Buses. Cmnd 9300, London: HMSO.
4. Department of Transport (1990) Bus and Coach Statistics Great Britain 1989/90 London: HMSO.
5. Evans A (1990) Competition and the structure of local bus markets. Journal of Transport Economics and Policy 24:255?281.