Não informado. (1970). Pipeline and Gas Journal. Petroleum Engineer Publishing.
Chicago-Zitierstil (17. Ausg.)Não informado. Pipeline and Gas Journal. Dallas, Tex: Petroleum Engineer Publishing, 1970.
MLA-Zitierstil (8. Ausg.)Não informado. Pipeline and Gas Journal. Petroleum Engineer Publishing, 1970.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.