1. An accessibility-maximization approach to road network planning;Antunes;Computer-Aided Civil and Infrastructure Engineering,2003
2. Bailey, L., 2007. Public Transportation and Petroleum Savings in the US: Reducing Dependence on Oil. Prepared for American Public Transportation Association. (accessed 22.07.09).
3. Bureau of Labor Statistics, 2009. The Employment Situation, June 2009. United States Department of Labor. (accessed 23.07.09).
4. A column generation approach to line planning in public transport;Borndorfer;Transportation Science,2007
5. Cambridge Systematics, Inc., KFH Group, Inc., McCollom Management Consulting, Inc., Hemily, B., 2009. TCRP Report 129: Local and Regional Funding Mechanisms for Public Transportation. Transportation Research Board of the National Academies, Washington, DC.