1. It Wasn't Supposed to Turn Out Like This: Federal Subsidies and Declining Transit Productivity;Charles Lave;Access,1994
2. Highway Statistics, Section 1, Vehicles, Drivers & Fuels, 1975. Federal Highway Administration, U.S. Department of Transportation, Washington, D.C. 1976. Various paging
3. A-1.2, A-1.5, and A-2.2. 7. National Transit Database;Monthly Performance Report,2008