Sampson, Anthony, 1926-2004. The seven sisters : the great oil companies and the world they shaped / Anthony Sampson. - New York : Viking Press, 1975. - xv, 334 p. : map ; 24 cm. ISBN: 067063591X LCCN: 75020268 LC Class. No.: HD9560.5 .S24 1975 / .S24 1975 Dewey Class. No.: 338.2/7/28209