Cook, R. C. (1941). Control of the petroleum industry by major oil companies. [publisher not identified].
Lua i Stíl Chicago (17ú heag.)Cook, Roy C. Control of the Petroleum Industry by Major Oil Companies. [Washington]: [publisher not identified], 1941.
Lua MLA (8ú heag.)Cook, Roy C. Control of the Petroleum Industry by Major Oil Companies. [publisher not identified], 1941.
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