APA (7th ed.) Citation

Petroleum Economist Ltd, Ruhrgas AG Essen, Fuller, K., & Bush, P. (1998). Gas in the CIS and Europe (5th ed.).

Chicago Style (17th ed.) Citation

Petroleum Economist Ltd, Ruhrgas AG Essen, K. Fuller, and P. Bush. Gas in the CIS and Europe. 5th ed. 1998.

MLA (9th ed.) Citation

Petroleum Economist Ltd, et al. Gas in the CIS and Europe. 5th ed. 1998.