@book{19789,
	author = {Kolman, Bernard, and Busby, Robert C.,},
	title = {Discrete mathematical structures /},
	publisher = {Pearson,},
	year = {c2014.},
	series = {Pearson custom library},
	address = {Harlow : },
	edition = {Pearson new international edition,6th edition.},
	note = {Sixth edition originally published: 2009. Fifth edition originally published: 2004.}
}