@book{6818,
	author = {Marsden, Jerrold E. and Tromba, Anthony.},
	title = {Vector calculus /},
	publisher = {W.H. Freeman,},
	year = {c2003.},
	address = {New York :},
	edition = {5th ed.},
	url = {http://www.loc.gov/catdir/enhancements/fy0906/2003049184-d.html}
}