@book{21932,
	author = {Valacich, Joseph S. and George, Joey F.},
	title = {Essentials of systems analysis and design /},
	publisher = {Prentice Hall,},
	year = {2006},
	address = {Upper Saddle River, NJ:},
	edition = {3rd ed.},
	note = {Includes glossary and index}
}