http://basica.sep.gob.mx/dgdc/sitio/pdf/PlanEdu2011.pdf
http://www.juntadeandalucia.es/averroes/mochiladigital/didactica/Andalucia_educativa_competencias_educativas.pdf
http://www.youtube.com/watch?v=9Vlvy2aCuIA&feature=related
http://www.youtube.com/watch?v=S5KbyREmB7k&feature=related
http://www.youtube.com/watch?v=oqDdJUcJE18&feature=related