Transportation Planning and Programming Division (2018). Texas County Mapbook(PDF) (Map) (2018 ed.). 1:72,224. Texas Department of Transportation. p. 1006. Retrieved July 14, 2021.
Transportation Planning and Programming Division (2018). Texas County Mapbook(PDF) (Map) (2018 ed.). 1:72,224. Texas Department of Transportation. p. 948. Retrieved July 14, 2021.
txdot.gov
Transportation Planning and Programming Division (n.d.). "Highway Designations Glossary". Texas Department of Transportation. Archived from the original on July 10, 2022. Retrieved May 20, 2020.
Statewide Planning Map (Map). Cartography by Transportation Planning and Programming Division. Texas Department of Transportation. 2013. Archived from the original on April 1, 2013. Retrieved June 11, 2013.
Transportation Planning and Programming Division (n.d.). "Highway Designations Glossary". Texas Department of Transportation. Archived from the original on July 10, 2022. Retrieved May 20, 2020.
Statewide Planning Map (Map). Cartography by Transportation Planning and Programming Division. Texas Department of Transportation. 2013. Archived from the original on April 1, 2013. Retrieved June 11, 2013.