.Brown, S. L., & Errera, S. (1987). Trading energy futures: A manual for energy industry professionals. Quorum Books.
Cita Chicago (17th ed.).Brown, Stewart L., i Steven Errera. Trading Energy Futures: A Manual for Energy Industry Professionals. New York: Quorum Books, 1987.
Cita MLA (9th ed.).Brown, Stewart L., i Steven Errera. Trading Energy Futures: A Manual for Energy Industry Professionals. Quorum Books, 1987.
Atenció: Aquestes cites poden no estar 100% correctes.