.Brown, S. L., & Errera, S. (1987). Trading energy futures: A manual for energy industry professionals. Quorum Books.
Chicago-čujuhus (17. p.).Brown, Stewart L., juo Steven Errera. Trading Energy Futures: A Manual for Energy Industry Professionals. New York: Quorum Books, 1987.
MLA-čujuhus (9. p.).Brown, Stewart L., juo Steven Errera. Trading Energy Futures: A Manual for Energy Industry Professionals. Quorum Books, 1987.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.