Não informado. (2017). Petroleum Management. Petroleum Engineer Publishing.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Petroleum Management. Dallas, Tex: Petroleum Engineer Publishing, 2017.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Petroleum Management. Petroleum Engineer Publishing, 2017.
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