Sampson, A. (1975). The Seven Sisters: The greate oil companies and the world they made. London: Hodder and Stoughton.
শিকাগো স্টাইলে সাইটেশনSampson, Anthony. The Seven Sisters: The Greate Oil Companies and the World They Made. London: Hodder and Stoughton, 1975.
এমএলএ সাইটেশনSampson, Anthony. The Seven Sisters: The Greate Oil Companies and the World They Made. London: Hodder and Stoughton, 1975.
সতর্কবাণী: সাইটেশন সবসময় 100% নির্ভুল হতে পারে না.