5Ariel Cohen, Ph.D. and Rafal Alasa, “Africa's Oil and Gas Sector: Implications for U.S. Policy”,at http://www.heritage.org/Research/Africa/bg2052.cfm.
6"National Security Consequences of U.S. Oil Dependency", at http://www.cfr.org/publication/11683/.
8"2007 Comprehensive Report on U.S. Trade and Investment Policy Toward Sub-Saharan Africa and Implementation of the African Growth and Opportunity Act ,The Seventh of Eight Annual Reports" , May 2007, at http://www.ustr.gov/assets/Trade_Development/Preference_Programs/AGOA/asset_upload_file762_11294.pdf.
