@book{51376,
	author = {Valacich,  Joseph S. and George, Joey F.},
	title = {Essentials of system analysis and design/},
	publisher = {Prentice Hall,},
	year = {c2009},
	address = {Englewood Cliffs, N.J :},
	edition = {4th ed.},
	note = {Includes glossary and index}
}