William D Middleton, « US Transit growth despite funding cuts », in International Railway Journal oct 1996, 2 p.


« / » https://elischolar.library.yale.edu/cgi/viewcontent.cgi?article=1073&context=applebaum_award
« / » https://nacto.org/docs/usdg/nchrprpt672.pdf
« / » https://kcstreetcar.org/wp-content/uploads/2019/04/KCStreetcarMainStExt_AppendixD_Final_04.16.19.pdf
« / » https://apps.itd.idaho.gov/apps/research/Completed/RP267_Vol-1.pdf
« / » https://www.vtpi.org/tranben.pdf
« / » https://www.reportlinker.com/p05934736/Bus-Market-Growth-Trends-and-Forecasts.html