Ministerio de Educación Nacional (2006), Estándares Básicos de Competencias en Lenguaje, Matemáticas, Ciencias y Ciudadanas: Guía sobre lo que los estudiantes deben saber y saber hacer con lo que aprenden. Bogotá.
http://www.youtube.com/watch?v=zQHqa7tpAIY
http://www.youtube.com/watch?v=dH7FqsBtnSo&feature=related
http://www.youtube.com/watch?v=bpG6kr2BoFA&feature=related
http://www.youtube.com/watch?v=Zv0_ZVzZ3E0&feature=related
http://www.youtube.com/watch?v=quqN2GERiNE&feature=related
http://www.youtube.com/watch?v=5Ko6fhRMigY&feature=related
http://www.youtube.com/watch?v=IZIXpjVgFV4&feature=related
http://www.youtube.com/watch?v=eT2IqHidP78&feature=related
http://www.youtube.com/watch?v=03_FzoIqoXs&feature=related
http://www.youtube.com/watch?v=zQHqa7tpAIY
http://www.youtube.com/watch?v=dH7FqsBtnSo&feature=related
http://www.youtube.com/watch?v=bpG6kr2BoFA&feature=related
http://www.youtube.com/watch?v=Zv0_ZVzZ3E0&feature=related
http://www.youtube.com/watch?v=quqN2GERiNE&feature=related
http://www.youtube.com/watch?v=5Ko6fhRMigY&feature=related
http://www.youtube.com/watch?v=IZIXpjVgFV4&feature=related
http://www.youtube.com/watch?v=eT2IqHidP78&feature=related
http://www.youtube.com/watch?v=03_FzoIqoXs&feature=related
