@book{4649,
	author = {Shay, William A.},
	title = {Understanding data communications and networks /},
	publisher = {Thomson Brooks/Cole,},
	year = {c2004.},
	address = {Australia ;},
	edition = {3rd ed.},
	url = {http://www.loc.gov/catdir/enhancements/fy1302/2003109625-b.html}
}