1. American Trade Initiatives, Inc., 2001. Sustainable transportation practices in Europe. Report No. FHWA-PL-02-006. Federal Highway Administration, Washington, DC
2. External costs of Belgian freight traffic: a network analysis of their internalization;Beuthe,2002
3. Sustainable transportation: a US perspective;Black;Journal of Transport Geography,1996
4. Social Change and Sustainable Transport,2002
5. Sustainable urban transportation: performance indicators and some analytical approaches;Black;Journal of the Urban Planning and Development,2002