@book{10113,
	author = {Tocci, Ronald J. and Widmer, Neal S.},
	title = {Digital systems :},
	publisher = {Pearson Education,},
	year = {c2007.[Reprinted]},
	address = {Upper Saddle River, N.J. ;},
	edition = {9th ed.},
	note = {Includes index.}
}