@book{54508,
	author = {Rosen, Kenneth H.},
	title = {Discrete mathematics and its applications /},
	publisher = {McGraw Hill,},
	year = {2007.},
	address = {Boston [et al.] :},
	edition = {6th ed.},
	url = {http://koha.tu.koszalin.pl/cgi-bin/koha/opac-detail.pl?biblionumber=54508}
}