http://www.sica.int/busqueda/Noticias.aspx?IDItem=12040&IDCat=3&IdEnt=2&Idm=1&IdmStyle=1
http://www.irgltd.com/Resources/Publications/LAC/2001-07%20Actores%20y%20Agendas-Mercadeo%20Proambiental-Central%20America.pdf
Blog elaborado por Andres Lopez Astudillo alopez@icesi.edu.co