APA (7th ed.) Citation

Independent Petroleum Association of America. (1971). Petroleum independent. Independent Petroleum Association of America].

Chicago Style (17th ed.) Citation

Independent Petroleum Association of America. Petroleum Independent. [Tulsa, Okla.: Independent Petroleum Association of America], 1971.

MLA (8th ed.) Citation

Independent Petroleum Association of America. Petroleum Independent. Independent Petroleum Association of America], 1971.