.Brown, S. L., & Errera, S. (1987). Trading energy futures: A manual for energy industry professionals. Quorum Books.
Lua i Stíl Chicago (17ú heag.).Brown, Stewart L., agus Steven Errera. Trading Energy Futures: A Manual for Energy Industry Professionals. New York: Quorum Books, 1987.
Lua MLA (9ú heag.).Brown, Stewart L., agus Steven Errera. Trading Energy Futures: A Manual for Energy Industry Professionals. Quorum Books, 1987.
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