Não informado. (2004). Refining engineer. Petroleum Engineer Publishing.
Chicago-viite (17. p.)Não informado. Refining Engineer. Dallas, Tex: Petroleum Engineer Publishing, 2004.
MLA-viite (8. p.)Não informado. Refining Engineer. Petroleum Engineer Publishing, 2004.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.