1. Defense Logistics Agency Energy;Petroleum Quality Information System Report (PQIS),2010
2. Defense Logistics Agency: Energy, http://www.energy.dla.mil/DLA_finance_energy/Pages/dlafp03.aspx (accessed 14.11.12).
3. Report of the Defense Science Board Task Force on DoD Energy Strategy, More Fight-Less Fuel (Office of the Under Secretary of Defense For Acquisition, Technology, and Logistics. Washington, DC 20301, February 2008).
4. Hubbert's Peak: The Impending World Oil Shortage;Deffeyes,2001