@book{9,
	author = {Illowsky, Barbara, and Dean, Susan L.,},
	title = {Introductory statistics },
	note = {Includes index.},
	url = {http://102.220.23.79/cgi-bin/koha/opac-retrieve-file.pl?id=ab05112e6319b6e70caa41bbd0ce60b5}
}