MARC 21 format for bibliographic data: Including guidelines for content designation (1999 ed.). Washington: Library of Congress, Cataloging Distribution Service.

MARC 21 format for bibliographic data : Including guidelines for content designation / prepared by Network Development and MARC Standards Office, Library of Congress in cooperation with Standards and Support, Library and Archives Canada, Bibliographic Standards and Systems, British Library . — 1999 ed.. — Washington : Library of Congress, Cataloging Distribution Service. — v. (loose-leaf). — ISBN 9780660179490, 0660179490, 9780660177717 (v. 2), 0660177714 (v. 2), 9780844409894, 0844409898

MARC 21 Format for Bibliographic Data: Including Guidelines for Content Designation.1999 ed.Washington: Library of Congress, Cataloging Distribution Service.