@book{144526,
	author = {Whitten, Jeffrey L. and Bentley, Lonnie D.},
	title = {Systems analysis & design methods},
	publisher = {Richard D. Irwin, Inc.},
	year = {1989.},
	address = {Homewood, IL.,},
	edition = {2nd. ed.},
	note = {Includes index.}
}