Referencias
http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S0187-57952011000300007
https://redie.uabc.mx/redie/article/view/727/891
http://scielo.isciii.es/scielo.php?script=sci_arttext&pid=S1132-12962010000300011
http://rabida.uhu.es/dspace/bitstream/handle/10272/1912/b15150434.pdf?seq
https://www.redalyc.org/articulo.oa?id=194229980003
https://redie.uabc.mx/redie/article/view/727/891
http://scielo.isciii.es/scielo.php?script=sci_arttext&pid=S1132-12962010000300011
http://rabida.uhu.es/dspace/bitstream/handle/10272/1912/b15150434.pdf?seq
https://www.redalyc.org/articulo.oa?id=194229980003
