@book{97776,
	author = {Martinez Alvarez, Alma Leticia},
	title = {Uso de diderentes abonos en la asociación maíz - calabaza},
	publisher = {El autor,},
	year = {2010},
	address = {Chapingo, Méx. :},
	url = {http://10.13.5.2/tesis/109433.pdf}
}