Executive Summary(PDF). Program of Mass Transportation. Boston Regional Metropolitan Planning Organization: 2-9. January 2004. (原始内容(PDF)存档于February 20, 2012).
Brelsford, Laura. SWA Initiatives—June 2019(PDF). Massachusetts Bay Transportation Authority Department of System-Wide Accessibility: 2. June 5, 2019 [2020-01-06]. (原始内容存档(PDF)于2019-09-25).
Executive Summary(PDF). Program of Mass Transportation. Boston Regional Metropolitan Planning Organization: 2-9. January 2004. (原始内容(PDF)存档于February 20, 2012).
Brelsford, Laura. SWA Initiatives—June 2019(PDF). Massachusetts Bay Transportation Authority Department of System-Wide Accessibility: 2. June 5, 2019 [2020-01-06]. (原始内容存档(PDF)于2019-09-25).