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Zelle, Charles A. (September 16, 2016). "U.S. Bicycle Route 41 AASHTO Application"(PDF). Letter to AASHTO Special Committee on US Route Numbering. Minnesota Department of Transportation. Retrieved November 27, 2016.
Special Committee on U.S. Route Numbering (May 29, 2014). "Report to SCOH" (Report). Washington, DC: American Association of State Highway and Transportation Officials. Archived from the original(DOCX) on February 26, 2020. Retrieved June 1, 2014.
Special Committee on U.S. Route Numbering (November 14, 2016). "Special Committee on U.S. Route Numbering"(PDF) (Report). Washington, DC: American Association of State Highway and Transportation Officials. Archived from the original(PDF) on June 3, 2019. Retrieved November 27, 2016.
American Association of State Highway and Transportation Officials (June 30, 1982). "Route Number Designations". Archived from the original on May 15, 2006. Retrieved May 12, 2006 – via Maine Department of Transportation.
Special Committee on U.S. Route Numbering (May 29, 2014). "Report to SCOH" (Report). Washington, DC: American Association of State Highway and Transportation Officials. Archived from the original(DOCX) on February 26, 2020. Retrieved June 1, 2014.
Special Committee on U.S. Route Numbering (November 14, 2016). "Special Committee on U.S. Route Numbering"(PDF) (Report). Washington, DC: American Association of State Highway and Transportation Officials. Archived from the original(PDF) on June 3, 2019. Retrieved November 27, 2016.