@book{8034,
	author = {Shay, William A.},
	title = {Understanding data communications and networks, third edition /},
	publisher = {Cengage Learning,},
	year = {2003.},
	address = {[S.l.] :},
	edition = {3rd ed.},
	url = {http://www.amazon.com/exec/obidos/ASIN/0534383173/chopaconline-20}
}