APA
Porter E. D., American Petroleum Institute A. & Porter E. D. (1991). World petroleum supply. Washington: American Petroleum Institute, API.
Chicago
Porter Edward D, American Petroleum Institute API and Porter Edward D. 1991. World petroleum supply. Washington: American Petroleum Institute, API.
Harvard
Porter E. D., American Petroleum Institute A. and Porter E. D. (1991). World petroleum supply. Washington: American Petroleum Institute, API.
MLA
Porter Edward D, American Petroleum Institute API and Porter Edward D. World petroleum supply. Washington: American Petroleum Institute, API. 1991.