@book{28623,
	author = {Valacich, Joseph S. and George, Joey F. and Hoffer, Jeffrey A.},
	title = {Essentials of systems analysis and design},
	publisher = {Pearson Education, Inc,},
	year = {2015},
	address = {Hoboken, New Jersey :},
	edition = {Sixth Edition},
	note = {Includes bibliographical references and index}
}