Referecias Electrónicas 3

http://www.fao.org/ag/esp/revista/9901sp3.htm
http://www.ifoam.org/about_ifoam/pdfs/POA_folder_spanish.pdf
http://articulos.infojardin.com/huerto/agricultura-ecologica.htm
http://articulos.infojardin.com/articulos/jardineria-ecologica-plagas-enfermedades.htm
http://www.helsint.com/agricultura.html