Não informado. (2004). Refining engineer. Petroleum Engineer Publishing.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Refining Engineer. Dallas, Tex: Petroleum Engineer Publishing, 2004.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Refining Engineer. Petroleum Engineer Publishing, 2004.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.