Transportation Planning and Policy Division (January 2019). Map of Warren, Bradley County, Arkansas(PDF) (Map). 1:62500. Arkansas Department of Transportation. Retrieved June 9, 2022.
Planning and Research Division (May 12, 2021) [March 7, 2013]. General Highway Map, Benton County, Arkansas(PDF) (Map) (Revised ed.). 1:62500. Little Rock: Arkansas Department of Transportation. OCLC910921484. Retrieved May 30, 2022.
Transportation Planning and Policy Division (May 2008). Map of Hardy, Sharp County, Arkansas(PDF) (Map). 1:62500. Arkansas State Highway and Transportation Department. Retrieved June 26, 2022.
System Information and Research Division (2015). "Arkansas Road Log Database"(MDB). Arkansas State Highway and Transportation Department. Retrieved March 27, 2016.
General Highway Map, Bradley County, Arkansas(PDF) (Map). 1:62500. Cartography by Planning and Research Division. Arkansas State Highway and Transportation Department. June 18, 2008. Archived from the original(PDF) on January 27, 2021. Retrieved December 12, 2012.
Planning and Research Division (February 20, 1993). General Highway Map Prairie County, Arkansas(PDF) (Map). Little Rock: Arkansas State Highway and Transportation Department. Retrieved June 26, 2022.
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 May 30, 2022.
Special Committee on U.S. Route Numbering (November 20, 2014). "Report to SCOH"(PDF) (Report). Washington, DC: American Association of State Highway and Transportation Officials. Archived from the original(PDF) on January 28, 2019. Retrieved June 9, 2022.
General Highway Map, Bradley County, Arkansas(PDF) (Map). 1:62500. Cartography by Planning and Research Division. Arkansas State Highway and Transportation Department. June 18, 2008. Archived from the original(PDF) on January 27, 2021. Retrieved December 12, 2012.
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 May 30, 2022.
Special Committee on U.S. Route Numbering (November 20, 2014). "Report to SCOH"(PDF) (Report). Washington, DC: American Association of State Highway and Transportation Officials. Archived from the original(PDF) on January 28, 2019. Retrieved June 9, 2022.
Planning and Research Division (May 12, 2021) [March 7, 2013]. General Highway Map, Benton County, Arkansas(PDF) (Map) (Revised ed.). 1:62500. Little Rock: Arkansas Department of Transportation. OCLC910921484. Retrieved May 30, 2022.