Barón Amaris, L., and H. Delgado Mier. “Current situation of teaching of statistics on the level of primary education in the municipality of Valledupar: case study indigenous schools”. Revista MATUA ISSN: 2389-7422, Vol. 3, no. 1, July 2016, https://investigaciones.uniatlantico.edu.co/revistas/index.php/MATUA/article/view/1513.