APA (7th ed.) Citation

Petroleum Economist Ltd, BG Group, Fuller, K., & Bush, P. (2002). World gas map (2002 ed.). Petroleum Economist.

Chicago Style (17th ed.) Citation

Petroleum Economist Ltd, BG Group, K. Fuller, and P. Bush. World Gas Map. 2002 ed. London: Petroleum Economist, 2002.

MLA (9th ed.) Citation

Petroleum Economist Ltd, et al. World Gas Map. 2002 ed. Petroleum Economist, 2002.