ABD resmi kaynakları ve bunların web siteleri şöyle sıralanıyor:

* ABD Gümrük Tarifeleri: www.usitc.gov/taffairs.htm

* GSPGenel Preferanslar Sistemi: www.ustr.gov/reports/gsp

* Department of State Economic and Trade Policy: www.state.gov/www/issues/economic/

* Export-Import Bank of the United States: www.exim.gov

* Federal Trade Commission: www.ftc.gov

* Internal Revenue Service Tax Publications: www.irs.ustreas.gov

* OPIC Overseas Private Investment Corporation: www.opic.gov

* U.S. Agency for International Development: www.info.usaid.gov

* U.S. Patent and Trademark Office: www.uspto.gov