Sampson, A. (1975). Seven Sisters: The great oil companies and the world they shaped. Bantam Book.
Chicago-referens (17:e uppl.)Sampson, Anthony. Seven Sisters: The Great Oil Companies and the World They Shaped. USA: Bantam Book, 1975.
MLA-referens (9:e uppl.)Sampson, Anthony. Seven Sisters: The Great Oil Companies and the World They Shaped. Bantam Book, 1975.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.