http://www.mineducacion.gov.co/1621/article-87646.html
http://cec.vcn.bc.ca/mpfc/modules/mon-miss.htm
http://repositorio.educacion.gov.ar/dspace/bitstream/handle/123456789/95631/EL001338.pdf?sequence=1
http://www.scielo.org.ve/scielo.php?pid=S0798-97922002000300007&script=sci_arttext
Acceso a la UCE
http://www.uce.edu.do/SitePages/Inicio.aspx