https://web.archive.org/web/20180315133312/https://aprendeenlinea.udea.edu.co/revistas/index.php/ceo/article/viewFile/1234/956|fechaarchivo=15 de marzo de 2018 (es)
https://web.archive.org/web/20180315133312/https://aprendeenlinea.udea.edu.co/revistas/index.php/ceo/article/viewFile/1234/956|fechaarchivo=15 de marzo de 2018 (es)