APA

Ham P., Cleaves G., Lawlor J., Exxon, World Petroleum Congress (10th : 1979 sept. 9-14 : Bucharest), Cleaves G., Lawlor J. & Exxon.Operation data reconciliation. : .

Chicago

Ham P.G, Cleaves G.W, Lawlor J.K, Exxon, World Petroleum Congress (10th : 1979 sept. 9-14 : Bucharest), Cleaves G.W, Lawlor J.K and Exxon.Operation data reconciliation. : .

Harvard

Ham P., Cleaves G., Lawlor J., Exxon, World Petroleum Congress (10th : 1979 sept. 9-14 : Bucharest), Cleaves G., Lawlor J. and Exxon.Operation data reconciliation. : .

MLA

Ham P.G, Cleaves G.W, Lawlor J.K, Exxon, World Petroleum Congress (10th : 1979 sept. 9-14 : Bucharest), Cleaves G.W, Lawlor J.K and Exxon.: . .