Economist Intelligence Unit. Country Profile: Yemen. London: Economist Intelligence Unit, 2001.
Embassy of the Republic of Yemen. <http://www.yemenembassy.org>. Accessed September 2001.
U.S. Central Intelligence Agency. World Factbook 2001. <http://www.odci.gov/cia/publications/factbook/index.html>. Accessed September 2001.
U.S. Department of State. FY 2001 Country Commercial Guide: Yemen. <http://www.state.gov/www/about_state/business/com_guides/2001/nea/index.html>. Accessed September 2001.