APA (7th ed.) Citation

(2011). Unconventional oil & gas map of the world. Petroleum Economist.

Chicago Style (17th ed.) Citation

Unconventional Oil & Gas Map of the World. London: Petroleum Economist, 2011.

MLA (9th ed.) Citation

Unconventional Oil & Gas Map of the World. Petroleum Economist, 2011.

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