@book{181610,
	author = {Tokheim, Roger L.},
	title = {Digital electronics : (Include CD)  },
	publisher = {McGraw-Hill Higher Education,},
	year = {c2008.},
	address = {Boston :},
	edition = {6th ed.},
	url = {http://www.loc.gov/catdir/toc/ecip073/2006035517.html}
}