@book{26,
	author = {Tan, S. T.},
	title = {Calculus for the managerial, life, and social sciences /},
	publisher = {Brooks/Cole Pub. Co.,},
	year = {c1997.},
	address = {Pacific Grove, CA :},
	edition = {4th ed.},
	url = {http://www.loc.gov/catdir/enhancements/fy1515/96035764-d.html}
}