Bibliografia
Principal
- The Geography of Transport Systems: Rodrigue, J-P (ed) 2000 Fifth Edition, New York: Routledge
- Handbook of transport and the environment: Hensher, D.A., & Button, K.J. (Eds.) 2003 Elsevier
- Transport: An economics and management perspective: Hensher, D., & Brewer, A. 2001 Oxford University Press