@book{1960,
	author = {Whitten, Jeffrey L. and Bentley, Lonnie D.},
	title = {Systems analysis and design methods. /},
	publisher = {Irwin/McGraw-Hill,},
	year = {2001.},
	address = {Boston, Mass. :},
	edition = {5th ed.},
	url = {http://www.loc.gov/catdir/enhancements/fy0610/00040694-d.html}
}