Calculated using penetration rate and population data from "Countries and Areas Ranked by Population: 2012", Population data, International Programs, U. S. Census Bureau, retrieved 26 June 2013
"Burkina Faso", Country Reports on Human Rights Practices for 2012, Bureau of Democracy, Human Rights and Labor, U. S. Department of State, 18 April 2013. Retrieved 11 February 2014.