Sampson, A. (1975). The seven sisters: The greate oil companies and the world they shaped. New York: Bantam Books, Inc.
শিকাগো স্টাইলে সাইটেশনSampson, Anthony. The Seven Sisters: The Greate Oil Companies and the World They Shaped. New York: Bantam Books, Inc, 1975.
এমএলএ সাইটেশনSampson, Anthony. The Seven Sisters: The Greate Oil Companies and the World They Shaped. New York: Bantam Books, Inc, 1975.
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