@book{4731,
	author = {Bignell, James. and Donovan, Robert.},
	title = {Digital electronics /},
	publisher = {Thomson Delmar Learning,},
	year = {c2007.},
	address = {Clifton Park, NY :},
	edition = {5th ed.},
	url = {http://www.loc.gov/catdir/enhancements/fy1104/2006008057-b.html}
}