APA

Russum L., Leask J., Amoco, World Petroleum Congress (10th : 1979 sept. 9-14 : Bucharest), Leask J. & Amoco.Economic impact of environmental regulations on the petroleum industry in the United States. : .

Chicago

Russum L.W, Leask J.A, Amoco, World Petroleum Congress (10th : 1979 sept. 9-14 : Bucharest), Leask J.A and Amoco.Economic impact of environmental regulations on the petroleum industry in the United States. : .

Harvard

Russum L., Leask J., Amoco, World Petroleum Congress (10th : 1979 sept. 9-14 : Bucharest), Leask J. and Amoco.Economic impact of environmental regulations on the petroleum industry in the United States. : .

MLA

Russum L.W, Leask J.A, Amoco, World Petroleum Congress (10th : 1979 sept. 9-14 : Bucharest), Leask J.A and Amoco.: . .