@book{17,
	author = {Haag, Stephen. and Cummings, Maeve.},
	title = {Computing concepts : complete edition /},
	publisher = {McGraw-Hill Technology Education,},
	year = {c2004.},
	address = {Boston :},
	edition = {2nd ed.},
	url = {http://www.loc.gov/catdir/toc/mh051/2003054084.html}
}