1. J. E. Anderson. 1978. Transit Systems Theory Lexington Books D. C. Heath and Company Lexington MA Equation (3.6.21) p. 42.
2. Optimization of Transit-System Characteristics;Anderson J. E.;Journal of Advanced Transportation,1984
3. Automated Transit Vehicle Size Considerations;Anderson J. E.;Journal of Advanced Transportation,1986
4. Safe Design of Personal Rapid Transit Systems;Anderson J. E.;Journal of Advanced Transportation,1988
5. J. E. Anderson. 1997. "The Effects of Redundancy on Failure Frequency in Personal Rapid Transit Systems." Transit Systems Theory www.taxi2000.com.