@book{172964,
	author = {Beer, Ferdinand P. and Johnston, E. Russell},
	title = {Vector mechanics for engineers.},
	publisher = {McGraw-Hill,},
	year = {c2004.},
	address = {Boston :},
	edition = {7th ed.},
	url = {http://www.loc.gov/catdir/enhancements/fy0702/2003269224-d.html}
}