@book{87039,
	author = {Beskeen, David W..},
	title = {Microsoft office 2013 :},
	publisher = {Cengage Learning,},
	year = {2013},
	address = {[S. l.] :},
	url = {http://www.loc.gov/catdir/enhancements/fy1409/2013931002-t.html}
}