"Road Building Equipment". Constructing roads into forestry work areas. Caterpillar. 2007. Hentet 2007-04-20.
mrsc.org
"Washington State County Road Standards". Chapter 35.78 RCW requires cities and counties to adopt uniform definitions and design standards for municipal streets and roads. Municipal Research & Services Center of Washington. 2005. Arkiveret fra originalen 27. september 2007. Hentet 2007-04-20.
"Volvo Construction Equipment (Europe)". Building the cities, towns, streets, highways and bridges in your neighborhood and in communities around the globe. Volvo. 2007. Hentet 2007-04-20.
web.archive.org
"Washington State County Road Standards". Chapter 35.78 RCW requires cities and counties to adopt uniform definitions and design standards for municipal streets and roads. Municipal Research & Services Center of Washington. 2005. Arkiveret fra originalen 27. september 2007. Hentet 2007-04-20.