@book{2939,
	author = {Kolman, Bernard. and Busby, Robert C.,},
	title = {Discrete mathematical structures /},
	publisher = {Pearson/Prentice Hall,},
	year = {2009.},
	address = {Upper Saddle River, NJ :},
	edition = {6th ed.},
	note = {Includes index.}
}