APA (7th ed.) Citation

Petroleum Economist Ltd & Ruhrgas AG Essen. (1997). Gas in the CIS and Europe (4th ed.). Petroleum Economist.

Chicago Style (17th ed.) Citation

Petroleum Economist Ltd and Ruhrgas AG Essen. Gas in the CIS and Europe. 4th ed. London, U.K.: Petroleum Economist, 1997.

MLA (9th ed.) Citation

Petroleum Economist Ltd and Ruhrgas AG Essen. Gas in the CIS and Europe. 4th ed. Petroleum Economist, 1997.

Warning: These citations may not always be 100% accurate.