APA

Kohlhase K., Lawrance P., BP International Limited, World Petroleum Congress (12th : 1987 26 abr/1 may : Houston), Lawrance P. & BP International Limited.The challenge to refining technology to meet new requirements. : .

Chicago

Kohlhase K.R, Lawrance P.A, BP International Limited, World Petroleum Congress (12th : 1987 26 abr/1 may : Houston), Lawrance P.A and BP International Limited.The challenge to refining technology to meet new requirements. : .

Harvard

Kohlhase K., Lawrance P., BP International Limited, World Petroleum Congress (12th : 1987 26 abr/1 may : Houston), Lawrance P. and BP International Limited.The challenge to refining technology to meet new requirements. : .

MLA

Kohlhase K.R, Lawrance P.A, BP International Limited, World Petroleum Congress (12th : 1987 26 abr/1 may : Houston), Lawrance P.A and BP International Limited.: . .