@book{2018,
	author = {Barnett, Raymond A. and Byleen, Karl E, autor.},
	title = {Trigonometría analítica :},
	publisher = {Thomson, },
	year = {2001},
	address = {México, D. F.  :},
	edition = {Séptima edición},
	note = {Incluye índice.}
}