Gulf oil corporation 75 years : 1901-1976.
MLA
Gulf Oil Corporation 75 Years : 1901-1976. S.l.: Gulf Companies, 1976.
APA
(1976). Gulf oil corporation 75 years : 1901-1976. S.l.: Gulf Companies.
Chicago
Gulf Oil Corporation 75 Years: 1901-1976. S.l.: Gulf Companies, 1976.