MARC 21 format for holdings data :
including guidelines for content designation /
prepared by Network Development and MARC Standards Office, Library of Congress, in cooperation with Standards and Support, National Library of Canada.

APA Citation

National Library of Canada. Standards and Support., Library of Congress. Network Development and MARC Standards Office. (2000). MARC 21 format for holdings data: including guidelines for content designation. 2000 ed. Washington, D.C.: Library of Congress, Cataloging Distribution Service .

MLA Citation

National Library of Canada. Standards and Support, and Library of Congress. Network Development and MARC Standards Office. MARC 21 Format for Holdings Data: Including Guidelines for Content Designation. 2000 ed. Washington, D.C.: Library of Congress, Cataloging Distribution Service , 2000.