APA

Porter E. D., American Petroleum Institute A. & Porter E. D. (1990). Non-OPEC supply and world petroleum markets. Washington: American Petroleum Institute, API.

Chicago

Porter Edward D, American Petroleum Institute API and Porter Edward D. 1990. Non-OPEC supply and world petroleum markets. Washington: American Petroleum Institute, API.

Harvard

Porter E. D., American Petroleum Institute A. and Porter E. D. (1990). Non-OPEC supply and world petroleum markets. Washington: American Petroleum Institute, API.

MLA

Porter Edward D, American Petroleum Institute API and Porter Edward D. Non-OPEC supply and world petroleum markets. Washington: American Petroleum Institute, API. 1990.