APA-Zitierstil (7. Ausg.)

(2010). National oil companies of the world (2. ed.). Petroleum Economist.

Chicago-Zitierstil (17. Ausg.)

National Oil Companies of the World. 2. ed. London: Petroleum Economist, 2010.

MLA-Zitierstil (9. Ausg.)

National Oil Companies of the World. 2. ed. Petroleum Economist, 2010.