@book{12375,
	author = {ELDERTON, Wiliam Palin and JOHNSON, Norman Lloyd},
	title = {Systems of frequency curves /},
	year = {1969.},
	address = {Cambridge,},
	url = {http://koha.tu.koszalin.pl/cgi-bin/koha/opac-detail.pl?biblionumber=12375}
}