United States. Federal Transit Administration, Transit Cooperative Research Program, Transit Development Corporation, National Research Council (U.S.). Transportation Research Board, Burckhardt, J. E., McGavock, A. T., . . . Mitchell, C. G. B. (2002). Improving public transit options for older persons. National Academy Press.
Παραπομπή σε μορφή Chicago (17η εκδ.)United States. Federal Transit Administration, Transit Cooperative Research Program, Transit Development Corporation, National Research Council (U.S.). Transportation Research Board, Jon E. Burckhardt, Adam T. McGavock, Charles A. Nelson, και C. G. B. Mitchell. Improving Public Transit Options for Older Persons. Washington, D.C: National Academy Press, 2002.
Παραπομπή σε μορφή MLA (9th εκδ.)United States. Federal Transit Administration, et al. Improving Public Transit Options for Older Persons. National Academy Press, 2002.