Cibergrafía.

http://repositorio.uta.edu.ec/handle/123456789/4716

http://www.redalyc.org/articulo.oa?id=64602103

http://jaimevallejo-adsi.blogspot.com/2009/11/que-es-la-homeostasis-en-tgs.html

http://image.slidesharecdn.com/sisistemas-131101162820-phpapp02/95/teoria-geral-de-sisistemas-6-638.jpg?cb=1383323333

http://gestioncon.blogspot.com/2012/07/recursividad-en-la-gestion-del.html