@book{1924,
	author = {Wonnacott, Paul, and Wonnacott, Ronald,},
	title = {Economía /},
	publisher = {McGraw-Hill,},
	year = {1992, 1997, 1999.},
	address = {Madrid :},
	edition = {4a ed.},
	note = {Versión original en inglés: Economics. Traducción: Francesc Sole i Parellada.}
}