http://www.virtual.unal.edu.co/cursos/sedes/manizales/4100002/lecciones/instrumentos/arbol.htm

http://tesismge20092010.blogspot.com/

http://www.globalccu.com/

http://www.globalccu.com/images2010/globalccu-ebooks/The-Corporate-University-Handbook.pdf

http://ucorppub.blogspot.com/

http://webquestjir.blogspot.com/2009/07/enfoques-de-aprendizaje-view-more.html