@book{99520,
	author = {García Avalos, Emiliano. and Valdivia Alcalá, Ramón},
	title = {Valoración económica del río Axtla, en Axtla de Terrazas, S.L.P.},
	publisher = {El autor,},
	year = {2010.},
	address = {Chapingo, Méx. :},
	url = {http://10.13.5.2/tesis/111178.pdf}
}