Severen, Chris. "A Ticket to Ride : Estimating the Benefits of Rail Transit," in Federal Reserve Bank of Philadelphia. "Second Quarter 2020, Volume 5, Issue 2," Economic Insights (Federal Reserve Bank of Philadelphia) (March 2020) : 3-11. https://fraser.stlouisfed.org/title/6149/item/594218/toc/536645 , accessed on April 19, 2024.