@book{12835,
	author = {Zill, Dennis G. and Dewar, Jacqueline M.},
	title = {Precalculus with calculus previews :},
	publisher = {Jones and Bartlett Publishers,},
	year = {2010.},
	address = {Sudbury, Mass. :},
	edition = {4a ed.},
	note = {Incluye índice}
}