"C-Tran unveils 'The Vine'". The Reflector. Battle Ground, WA. April 22, 2015. p. A3. Retrieved May 30, 2015.
wa.gov
ftp.wsdot.wa.gov
Public Transportation and Planning Division (November 1982). Public Transportation in Washington State, 1981(PDF) (Report). Washington State Department of Transportation. p. 9. Retrieved January 17, 2018.