Burkhardt, J. E., Koffman, D., & Murray, G. (2003). Economic benefits of coordinating human service transportation and transit services. Transportation Research Board.
Chicago-viite (17. p.)Burkhardt, Jon E., David Koffman, ja Gail Murray. Economic Benefits of Coordinating Human Service Transportation and Transit Services. Washington, D.C: Transportation Research Board, 2003.
MLA-viite (9. p.)Burkhardt, Jon E., et al. Economic Benefits of Coordinating Human Service Transportation and Transit Services. Transportation Research Board, 2003.
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