@book{91870,
	author = {Rosales de León, Humberto.},
	title = {Producción orgánica de Zanahoria (Daucus carota L.) Y col (Brassica oleraceae L.) /},
	publisher = {El autor,},
	year = {2005.},
	address = {Chapingo, Méx. :},
	url = {http://10.13.5.2/tesis/103408.pdf}
}