"Executive Summary"(PDF). Program of Mass Transportation. Boston Regional Metropolitan Planning Organization. January 2004. p. 2-9. Archived from the original(PDF) on February 20, 2012.
"Executive Summary"(PDF). Program of Mass Transportation. Boston Regional Metropolitan Planning Organization. January 2004. p. 2-9. Archived from the original(PDF) on February 20, 2012.
"Subway Map"(PDF). Massachusetts Bay Transportation Authority. 2001. Archived from the original(PDF) on July 1, 2001.