Duncan, M., K. Gladwin, B. Wood, Y. Valdez Torres, and M. Horner. “Transit-Oriented Development for Older Adults: A Survey of Current Practices Among Transit Agencies and Local Governments in the US”. Journal of Transport and Land Use, vol. 14, no. 1, Feb. 2021, pp. 255-76, doi:10.5198/jtlu.2021.1798.