Helman, Udi; Hobbs, Benjamin F.; O'Neill, Richard P. (1 January 2008), Sioshansi, Fereidoon P. (ed.), "Chapter 5 – The Design of US Wholesale Energy and Ancillary Service Auction Markets: Theory and Practice", Competitive Electricity Markets, Elsevier Global Energy Policy and Economics Series, Oxford: Elsevier, pp. 179–243, doi:10.1016/b978-008047172-3.50009-x, ISBN9780080471723
Business knowledge for IT in prime brokerage : a complete handbook for IT professionals (1st ed.). London: Essvale Corp. 2008. p. 89. ISBN9781906096038. OCLC727175393.
Elder, Alexander (27 October 2014). The new trading for a living: psychology, discipline, trading tools and systems and risk control, trade management. Hoboken, New Jersey: Wiley. p. 186. ISBN9781118443927. OCLC903658661.