@book{288739,
	author = {Zill, Dennis G.,},
	title = {A first course in differential equations with modeling applications /},
	publisher = {Cengage Learning,},
	year = {2013.},
	address = {Andover :},
	edition = {8th edition.},
	note = {Includes appendix and index.},
	url = {http://www.loc.gov/catdir/enhancements/fy1303/2011944307-b.html}
}