APA

Sankey B., Clarke G., ESSO Petroleum Canada, World Petroleum Congress (12th : 1987 26 abr/1 may : Houston), Clarke G. & ESSO Petroleum Canada.Heavy oil upgrading as a function of raw material, geographic site and market demand. : .

Chicago

Sankey B.M, Clarke G.G, ESSO Petroleum Canada, World Petroleum Congress (12th : 1987 26 abr/1 may : Houston), Clarke G.G and ESSO Petroleum Canada.Heavy oil upgrading as a function of raw material, geographic site and market demand. : .

Harvard

Sankey B., Clarke G., ESSO Petroleum Canada, World Petroleum Congress (12th : 1987 26 abr/1 may : Houston), Clarke G. and ESSO Petroleum Canada.Heavy oil upgrading as a function of raw material, geographic site and market demand. : .

MLA

Sankey B.M, Clarke G.G, ESSO Petroleum Canada, World Petroleum Congress (12th : 1987 26 abr/1 may : Houston), Clarke G.G and ESSO Petroleum Canada.: . .