APA

Douwes C., Klinken J. v., Wijffels J., Shell, World Petroleum Congress (10th : 1979 sept. 9-14 : Bucharest), Klinken J. v., Wijffels J. & Shell.Developments in hydroconversion processes for residues. : .

Chicago

Douwes C.Th, Klinken J van, Wijffels J.B, Shell, World Petroleum Congress (10th : 1979 sept. 9-14 : Bucharest), Klinken J van, Wijffels J.B and Shell.Developments in hydroconversion processes for residues. : .

Harvard

Douwes C., Klinken J. v., Wijffels J., Shell, World Petroleum Congress (10th : 1979 sept. 9-14 : Bucharest), Klinken J. v., Wijffels J. and Shell.Developments in hydroconversion processes for residues. : .

MLA

Douwes C.Th, Klinken J van, Wijffels J.B, Shell, World Petroleum Congress (10th : 1979 sept. 9-14 : Bucharest), Klinken J van, Wijffels J.B and Shell.: . .