APA

Long G., Sobel J., Esso, World Petroleum Congress (12th : 1987 26 abr/1 may : Houston), Sobel J. & ESSO.Factors influencing selection of octane improvement steps in Europe. : .

Chicago

Long G.H, Sobel J.E, Esso, World Petroleum Congress (12th : 1987 26 abr/1 may : Houston), Sobel J.E and ESSO.Factors influencing selection of octane improvement steps in Europe. : .

Harvard

Long G., Sobel J., Esso, World Petroleum Congress (12th : 1987 26 abr/1 may : Houston), Sobel J. and ESSO.Factors influencing selection of octane improvement steps in Europe. : .

MLA

Long G.H, Sobel J.E, Esso, World Petroleum Congress (12th : 1987 26 abr/1 may : Houston), Sobel J.E and ESSO.: . .