1. The potential of public transport smartcard data;Bagchi;Transport Policy,2005
2. Baker, Stuart (2007). Standing Room only?: The impact on bus use resulting from the move from a half-fare to a free fare concessionary bus pass in a shire area of England—case study of Salisbury District, Wiltshire. M.Sc. Research Dissertation, Transport Planning and Management, University of Westminster, 2007 (unpublished).
3. Balcombe, R., Mackett, R., Paulley, N., Preston, J., Shires, J., Titheridge, H., Wardman, M., and White, P. (2004). The Demand for Public Transport: A Practical Guide. Transport Research Laboratory Report TRL593.
4. Carmarthenshire County Council, 2003. Environment and Infrastructure Scrutiny. Concessionary Fares in Carmarthenshire’. Accessed at http://online.carmarthenshire.gov.uk/agendas/eng/SEIN20031125/SUM05. HTM 24 August 2009.
5. Department for Transport 2007a. Public Transport Statistics Bulletin GB: 2007 Edition Supplement. Department for Transport, November 2007 (published only in electronic form, via website www.dft.gov.uk/transtat/).