Urrea Giraldo, F., and W. Botero-Arias. “Differential Socio-Demographic Patterns in Bogota and Cali from the 2005 Census and the Presence of Black Middle Classes in the Two Cities”. Sociedad Y Economía, no. 18, May 2010, pp. 85-112, doi:10.25100/sye.v0i18.4165.