1. Departamento Administrativo Nacional de Estadística. Boletín de Estadística.Monthly.
2. Dudley, Steven, Walking Ghosts: Murder and Guerrilla Politics in Colombia. 2004 (Dudley and Ghosts 2004)
3. Hylton, Forrest, Evil Hour in Colombia. 2006 (Hylton 2006)
4. Palacios, Marco, Between Legitimacy and Violence: A History of Colombia, 1875–2002. 2006 (Palacios 2006)
5. National Statistical Office: Departamento Administrativo Nacional de Estadística (DANE), AA 80043, Zona Postal 611, Bogotá.