@book{32834,
	author = {Hill, Fredrick J. and Peterson, Gerald R.},
	title = {Digital systems :},
	publisher = {Wiley,},
	year = {c1987.},
	address = {New York :},
	edition = {3rd ed.},
	url = {http://www.loc.gov/catdir/description/wiley031/86034027.html}
}