@book{4,
	author = {Swokowski, Earl William, and Cole, Jeffery A.},
	title = {Álgebra y trigonometría con geometría analítica /},
	publisher = {Thomson,},
	year = {c2006.},
	address = {México :},
	edition = {11a ed.},
	note = {Traducción de: Algebra and trigonometry with analytic geometry.}
}