@book{87252,
	author = {Contreras Guardado, J. Angel.},
	title = {Sistémas agroforestales y adopción de árboles de uso multiple:},
	publisher = {El autor,},
	year = {2003.},
	address = {Chapingo, Méx. :},
	url = {http://10.13.5.2/tesis/98769.pdf}
}