Authority 020 szerkesztése (szakasz)

== FIELD DEFINITION AND SCOPE ==


:International Standard Book Number (ISBN), terms of availability, and any canceled/invalid ISBN copied from field 020 of a MARC bibliographic record for a multipart item that is cataloged as a set.

:Inclusion of this field in the established heading record for a series provides a machine link within a system between the authority record for the series and a bibliographic record in which the heading is used as a series added entry. Each valid ISBN associated with the series is contained in a separate 020 field. The subfields in this field are defined for consistency with field 020 in the [http://www.loc.gov/marc/bibliographic/ecbdhome.html MARC 21 Format for Bibliographic Data].

:International Standard Serial Number (ISSN) associated with a heading for an issue of a serial for which series-type treatment is provided is contained in field 022 (International Standard Serial Number).