@book{552,
	author = {Wright, Paul H. and aAshford, Norman.},
	title = {Transportation engineering :},
	publisher = {J. Wiley,},
	year = {c1998.},
	address = {New York :},
	edition = {4th ed.},
	url = {http://www.loc.gov/catdir/description/wiley031/97015256.html}
}