MARC 040 Cataloging Source
MARC 21 field 040 in the bibliographic format contains the MARC code for or the name of the organization(s) that created the original bibliographic record, assigned MARC content designation and transcribed the record into machine-readable form, or modified (except for the addition of holdings symbols) an existing MARC record. These data and the code in the 008/39 (Cataloging source) specify the parties responsible for the bibliographic record. See: [Code List for Organizations for a listing of sources used in MARC 21 records.]
Formulation
When creating a new record, or adding a new description convention code (ǂe) to an existing record, the order of subfields should go as follows:
040 ǂa ǂb ǂe ǂc ǂd
040 ǂa ǂb ǂe ǂc ǂd
When using OCLC copy that has not been updated to meet this standard, it is not necessary to change it manually.