@book{220991,
	author = {National Library of Canada.},
	title = {MARC 21 format for classification data},
	publisher = {Library of Congress, Cataloging Distribution Service},
	year = {2000-},
	address = {Washington},
	note = {Description based on: update no.2 (Oct. 2001)},
	url = {http://catalog.gpo.gov/fdlpdir/locate.jsp?ItemNumber=0815-G-03&SYS=000610979}
}