@book{4884,
	author = {Erickson, Jon and Español Echániz, Ignacio},
	title = {La extinción de las especies},
	publisher = {McGraw-Hill},
	year = {1992},
	address = {Madrid :},
	url = {https://www.biblioeco.unsa.edu.ar/pmb/images/libros/L128182.jpg}
}