@book{211446,
	author = {Library of Congress.},
	title = {MARC 21 concise formats},
	publisher = {Library of Congress, Cataloging Distribution Service},
	year = {2000-.},
	address = {Washington [D.C.]},
	note = {Loose-leaf for updating.},
	url = {http://purl.access.gpo.gov/GPO/LPS42664}
}