Não informado. (1975). Chilton's oil and gas energy. Chilton Book.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Chilton's Oil and Gas Energy. Radnor, Pa: Chilton Book, 1975.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Chilton's Oil and Gas Energy. Chilton Book, 1975.
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