@book{1999,
	author = { Stewart, James},
	title = { Precálculo :},
	publisher = {CENGAGE Learning,},
	year = {2012.},
	address = {México :},
	edition = {Sexta edición.},
	url = {https://isae.metabiblioteca.org/cgi-bin/koha/opac-retrieve-file.pl?id=daded44ac68d5f8ba78a89af400ad46f}
}