@book{91511,
	author = {Pedraza Espinoza, María Magdalena. and Leos Rodríguez, Juan Antonio},
	title = {Prospectiva de la porcicultura del estado de Guanajuato/},
	publisher = {El autor,},
	year = {2005.},
	address = {Chapingo, Méx. :},
	url = {http://10.13.5.2/tesis/103047.pdf}
}