APA (7th ed.) Citation

Offshore Publications Limited. (2012). West Africa, 2012 offshore oil and gas concession map. Offshore Magazine.

Chicago Style (17th ed.) Citation

Offshore Publications Limited. West Africa, 2012 Offshore Oil and Gas Concession Map. [Tex?]: Offshore Magazine, 2012.

MLA (9th ed.) Citation

Offshore Publications Limited. West Africa, 2012 Offshore Oil and Gas Concession Map. Offshore Magazine, 2012.