California Department of Transportation. "State Truck Route List". Sacramento: California Department of Transportation. Archived from the original(XLS file) on September 5, 2015. Retrieved June 30, 2015.
"Article 2 of Chapter 2 of Division 1". California Streets and Highways Code. Sacramento: California Office of Legislative Counsel. Retrieved February 6, 2019.
California State Assembly. "An act...relating to state highways". 1983–1984 Session of the Legislature. Statutes of California. State of California. Ch. 409.
Road Map of California 1936 (Map). Cartography by Highways Division. State of California Department of Public Works.
Road Map of California 1956 (Map). Cartography by Highways Division. State of California Department of Public Works.
dot.gov
fhwa.dot.gov
Federal Highway Administration (March 25, 2015). National Highway System: California (North)(PDF) (Map). Scale not given. Washington, DC: Federal Highway Administration. Retrieved October 15, 2017. Federal Highway Administration (March 25, 2015). National Highway System: Vallejo, CA(PDF) (Map). Scale not given. Washington, DC: Federal Highway Administration. Retrieved October 15, 2017.
Natzke, Stefan; Neathery, Mike & Adderly, Kevin (June 20, 2012). "What is the National Highway System?". National Highway System. Washington, DC: Federal Highway Administration. Retrieved July 1, 2012.
California Department of Transportation. "State Truck Route List". Sacramento: California Department of Transportation. Archived from the original(XLS file) on September 5, 2015. Retrieved June 30, 2015.