Não informado. (2017). Petroleum Engineer for Management. Petroleum Engineer Publishing.
Chicago (17e ed.) BronvermeldingNão informado. Petroleum Engineer for Management. Dallas, Tex: Petroleum Engineer Publishing, 2017.
MLA (8e ed.) BronvermeldingNão informado. Petroleum Engineer for Management. Petroleum Engineer Publishing, 2017.
Let op: Deze citaties zijn niet altijd 100% accuraat.