Evans, J. (1986). OPEC, its member states and the world energy market. Longman.
Chicago-Zitierstil (17. Ausg.)Evans, John. OPEC, Its Member States and the World Energy Market. Harlow, Essex, U.K: Longman, 1986.
MLA-Zitierstil (9. Ausg.)Evans, John. OPEC, Its Member States and the World Energy Market. Longman, 1986.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.