@book{140,
	author = {Perspection, Inc.},
	title = {Microsoft PowerPoint 4 for Windows step by step /},
	publisher = {Microsoft Press,},
	year = {c1994.},
	address = {Redmond, Wash. :},
	url = {http://www.loc.gov/catdir/enhancements/fy1004/93047601-b.html}
}