APA

Correa N., Valle A., Cabral J., Petrobras, World Petroleum Congress (11th. : 1983 : London), Valle A., Cabral J. & Petrobras.Shale oil upgrading. : .

Chicago

Correa N.F, Valle A.A.F, Cabral J.R.A, Petrobras, World Petroleum Congress (11th. : 1983 : London), Valle A.A.F, Cabral J.R.A and Petrobras.Shale oil upgrading. : .

Harvard

Correa N., Valle A., Cabral J., Petrobras, World Petroleum Congress (11th. : 1983 : London), Valle A., Cabral J. and Petrobras.Shale oil upgrading. : .

MLA

Correa N.F, Valle A.A.F, Cabral J.R.A, Petrobras, World Petroleum Congress (11th. : 1983 : London), Valle A.A.F, Cabral J.R.A and Petrobras.: . .