1. Barnum D. T. and Gleason J. M. Measuring the Influence of Subsidies on Transit Efficiency and Effectiveness Urban Mass Transportation Administration Washington D.C. 1979.
2. Blalock Hubert M. Jr. Social Statistics revised 2nd ed. McGraw‐Hill Book Co. Inc. New York N.Y. 1979.
3. Effects of subsidies on urban public transport
4. “Broad‐Based Taxes ” and “Motor Vehicle User Charges ” Urban Mass Transportation Administration Transit Financing Fact Sheet Office of Methods and Support Washington D.C. 1982.
5. Cervero Robert Intergovernmental Responsibilities for Financing Public Transit Services Urban Mass Transportation U.S. Department of Transportation Washington D.C. 1982.