Não informado. Pipeline underground utilities construction. Oildom Publishing.
Chicago-referens (17:e uppl.)Não informado. Pipeline Underground Utilities Construction. Houston, Tex: Oildom Publishing.
MLA-referens (8:e uppl.)Não informado. Pipeline Underground Utilities Construction. Oildom Publishing.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.