Não informado. (2004). Refining engineer. Petroleum Engineer Publishing.
Chicago-Zitierstil (17. Ausg.)Não informado. Refining Engineer. Dallas, Tex: Petroleum Engineer Publishing, 2004.
MLA-Zitierstil (8. Ausg.)Não informado. Refining Engineer. Petroleum Engineer Publishing, 2004.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.