"De utilidad"(PDF). El Colombiano (in Spanish). 20 July 2009. pp. 3, 7. Archived from the original(PDF) on 17 September 2016. Retrieved 28 November 2017.
"De utilidad"(PDF). El Colombiano (in Spanish). 20 July 2009. pp. 3, 7. Archived from the original(PDF) on 17 September 2016. Retrieved 28 November 2017.