Não informado. (1970). Pipeline and Gas Journal. Petroleum Engineer Publishing.
Chicago-referens (17:e uppl.)Não informado. Pipeline and Gas Journal. Dallas, Tex: Petroleum Engineer Publishing, 1970.
MLA-referens (8:e uppl.)Não informado. Pipeline and Gas Journal. Petroleum Engineer Publishing, 1970.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.