@book{8321,
	author = {Black, Uyless.},
	title = {computer networks },
	publisher = {Prentice Hall International Paperback Editions,},
	year = {1999.},
	address = {[S.l.] :},
	url = {http://www.amazon.com/exec/obidos/ASIN/0131660918/chopaconline-20}
}