APA

Marhold A. L., Zeiner W. A., OMV (Viena), World Petroleum Congress (12th : 1987 26 abr/1 may : Houston), Zeiner W. A. & OMV (Viena).Consequences of lead phase-down in Europe. : .

Chicago

Marhold Aurel L, Zeiner Wolfgang A, OMV (Viena), World Petroleum Congress (12th : 1987 26 abr/1 may : Houston), Zeiner Wolfgang A and OMV (Viena).Consequences of lead phase-down in Europe. : .

Harvard

Marhold A. L., Zeiner W. A., OMV (Viena), World Petroleum Congress (12th : 1987 26 abr/1 may : Houston), Zeiner W. A. and OMV (Viena).Consequences of lead phase-down in Europe. : .

MLA

Marhold Aurel L, Zeiner Wolfgang A, OMV (Viena), World Petroleum Congress (12th : 1987 26 abr/1 may : Houston), Zeiner Wolfgang A and OMV (Viena).: . .