@book{8104,
	author = {Smith, Thomas M. and Leo Smith, Robert, },
	title = {Ecología /},
	publisher = {Pearson, },
	year = {c2007},
	address = {Madrid, Esp. :},
	edition = {6 ed.},
	note = {Título original: Elements of ecology},
	url = {https://www.cicy.mx/sitios/sib/doctoelectronico/8818.pdf}
}