"Executive Summary"(PDF). Program of Mass Transportation. Boston Regional Metropolitan Planning Organization. January 2004. pp. 2–9. Archived from the original(PDF) on February 20, 2012.
"Curiosity Carcards"(PDF). Massachusetts Bay Transportation Authority. Archived from the original(PDF) on February 18, 2017. Retrieved January 21, 2016.
"Green Line Type 9 Project Update"(PDF). Massachusetts Bay Transportation Authority. March 27, 2017. p. 11. Archived from the original(PDF) on March 29, 2017. Retrieved March 29, 2017.
"Curiosity Carcards"(PDF). Massachusetts Bay Transportation Authority. Archived from the original(PDF) on February 18, 2017. Retrieved January 21, 2016.
"Green Line Type 9 Project Update"(PDF). Massachusetts Bay Transportation Authority. March 27, 2017. p. 11. Archived from the original(PDF) on March 29, 2017. Retrieved March 29, 2017.
"Executive Summary"(PDF). Program of Mass Transportation. Boston Regional Metropolitan Planning Organization. January 2004. pp. 2–9. Archived from the original(PDF) on February 20, 2012.