Wagner, F. A. (1980). Energy impacts of urban transportation improvements. Institute of Transportation Engineers.
Cita Chicago (17th ed.)Wagner, Frederick A. Energy Impacts of Urban Transportation Improvements. Alexandría: Institute of Transportation Engineers, 1980.
Cita MLA (9th ed.)Wagner, Frederick A. Energy Impacts of Urban Transportation Improvements. Institute of Transportation Engineers, 1980.
Atenció: Aquestes cites poden no estar 100% correctes.