Não informado. (1975). Chilton's oil and gas energy. Chilton Book.
Lua i Stíl Chicago (17ú heag.)Não informado. Chilton's Oil and Gas Energy. Radnor, Pa: Chilton Book, 1975.
Lua MLA (8ú heag.)Não informado. Chilton's Oil and Gas Energy. Chilton Book, 1975.
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