@book{13520,
	author = {Emery, Glyn. and Bale, David},
	title = {Elements of Computer Science},
	publisher = {London: Pitman 1980.,},
	year = {1980.},
	address = {[S.l.] :},
	edition = {2nd edition},
	url = {http://www.amazon.com/exec/obidos/ASIN/B002JCEJR2/chopaconline-20}
}