.Brown, S. L., & Errera, S. (1987). Trading energy futures: A manual for energy industry professionals. Quorum Books.
Παραπομπή σε μορφή Chicago (17η εκδ.).Brown, Stewart L., και Steven Errera. Trading Energy Futures: A Manual for Energy Industry Professionals. New York: Quorum Books, 1987.
Παραπομπή σε μορφή MLA (9th εκδ.).Brown, Stewart L., και Steven Errera. Trading Energy Futures: A Manual for Energy Industry Professionals. Quorum Books, 1987.