Gaya APA

Hatch, L, F., Matar, S. (1981). From Hydrocarbons to Petrochemicals (1981). : Houston : Gulf Publishing Company,.

Gaya MLA

Hatch, Lewis, F., Matar, Sami. "From Hydrocarbons to Petrochemicals". 1981 : Houston : Gulf Publishing Company,, 1981. Text.