@book{214654,
	author = {Zill, Dennis G. and Dewar, Jacqueline M.},
	title = {Precalculus with calculus previews / },
	publisher = {Jones & Bartlett Learning, },
	year = {2017},
	series = {The Jones & Bartlett learning international series in mathematics },
	address = {Burlington : },
	edition = {6th ed.},
	note = {Includes index}
}