@book{115609,
	author = {Maxwell, John C., and Covey, Stephen R. },
	title = {Las 21 leyes irrefutables del liderazgo :},
	publisher = {Grupo Nelson,},
	year = {c2007.},
	address = {Nashville :},
	edition = {Rev. y actualizada ed. del 10o aniversario.},
	note = {Subtitle from cover.},
	url = {http://www.loc.gov/catdir/enhancements/fy1010/2010285725-d.html}
}