@book{50256,
	author = {Ashrafi,  Noushin.},
	title = {Object oriented systems analysis and design},
	publisher = {Prentice Hall,},
	year = {2008},
	address = {Upper Saddle River, NJ :},
	url = {http://www.loc.gov/catdir/toc/ecip0820/2008025798.html}
}