Cook, R. C. (1941). Control of the petroleum industry by major oil companies. [publisher not identified].
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCook, Roy C. Control of the Petroleum Industry by Major Oil Companies. [Washington]: [publisher not identified], 1941.
एमएलए (8वां संस्करण) प्रशस्ति पत्रCook, Roy C. Control of the Petroleum Industry by Major Oil Companies. [publisher not identified], 1941.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.