@book{1982,
	author = {Crowe, John. and Hayes-Gill, Barrie.},
	title = {Introduction to digital electronics /},
	publisher = {Arnold,},
	year = {1998.},
	address = {London :},
	note = {Includes index.},
	url = {http://www.loc.gov/catdir/toc/els051/00456391.html}
}