Não informado. (2018). Roads and Road Construction. Carriers Publishing Company.
Chicago-referens (17:e uppl.)Não informado. Roads and Road Construction. London: Carriers Publishing Company, 2018.
MLA-referens (8:e uppl.)Não informado. Roads and Road Construction. Carriers Publishing Company, 2018.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.