Sampson, A. (1975). The Seven Sisters: The greate oil companies and the world they made. London: Hodder and Stoughton.
استشهاد بنمط شيكاغوSampson, Anthony. The Seven Sisters: The Greate Oil Companies and the World They Made. London: Hodder and Stoughton, 1975.
MLA استشهادSampson, Anthony. The Seven Sisters: The Greate Oil Companies and the World They Made. London: Hodder and Stoughton, 1975.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.