Information:
The 020 tag of the MARC bibliographic format contains the
International Standard Book Number (ISBN), terms of
availability, and any canceled or invalid ISBN related to the item.
AACR2 covers standard numbers and terms of availability in rule
1.8 and in the X.8 subsection in each chapter (2.8, 3.8, etc.). RDA
provides instructions on recording identifiers (ISBNs) in 2.15 and terms
of availability in 4.2.1. Although originally created for books, ISBNs
can be found in all formats except manuscripts.
The International Standard Book Number consists of ten or
thirteen digits. The ten digit ISBN is made up of four parts:
Group identifier, Publisher identifier, Title identifier,
and Check digit. The Group identifier, Publisher identifier,
and Title identifier make up the first nine digits of
the ISBN. The Check digit is the tenth digit.
The thirteen digit ISBN consists of five elements. Element one
consists of a 3-digit EAN prefix that identifies the book
industry. The second element identifies the country or
language agency. Element three identifies the publisher
prefix. The fourth element identifies the titles or specific
edition and the fifth element contains a check digit.
Note: Some older books have SBNs. These can be turned
into ISBNs by adding the Group identifier, if known,
to the beginning of the number.
A valid ISBN is entered in subfield a of tag 020 and can be qualified
with information about the binding, format, volume numbers, part of a
set, publisher, distributor, etc. Qualifying information is entered in
subfield q. RDA 2.15.1.7 provides guidelines for recording the
qualifying information with examples showing this data enclosed in
parenthesis. An invalid or canceled ISBN and its qualifiers is entered
in subfield z. Tag 020 is repeatable, and each SBN must have its own
020 tag.
Terms of availability (usually price) are recorded in subfield c. A price
may be recorded in subfield c even when no ISBN is available for
the item.
Indicators
First Undefined
blank Undefined
Second Undefined
blank Undefined
Subfields
a International Standard Book Number (NR)
c Terms of availability (NR)
q Qualifying information (R)
z Canceled or invalid ISBN (R)
Examples:
Books with qualifying information in subfield q
(There is a discrepancy between how the qualifying data
is entered in subfield q in the MARC 21 documentation and
how it is entered following the RDA guidelines. MARC 21 shows
the data without parenthesis; RDA shows the data enclosed in
parenthesis. The Library of Congress and cataloging agencies
are following the RDA guidelines)
020 _a9780345532749_qtrade (MARC 21 format example)
020 _a9780345532756_q(ebook) (RDA example)
Destiny currently automatically adds parenthesis around this data
when displaying it. Thus, double parenthesis will display if the data
is entered enclosed in parenthesis as the RDA example shows.
Book in cloth and paperback bindings with prices in U.S. and
Canadian dollars
020 _a0590582475 :
_c$12.95 ($17.99 Can.)
020 _a0590205153 (pbk.) :
_c$4.95 ($5.95 Can.)
Book with different ISBNs for each distributor
020 _a0802850731 (Eerdmans)
020 _a0865433771 (Africa World Press)
Book with price but no ISBN
020 _c$5.95 (pbk.)
Book that has both valid and invalid or canceled ISBNs
on verso of title page
020 _a0397319924
_z0397319479
020 _z0397318487
Book printed on permanent paper
020 _a9780060723804 (alk. paper)
ISBNs for set as well as for individual volumes
020 _a0810392070 (set : acid-free paper)
020 _a0810392119 (v. 1 : acid-free paper)
020 _a0810392097 (v. 2 : acid-free paper)
020 _a0810392100 (v. 3 : acid-free paper)
Computer program disk with an ISBN
020 _a0874904099 :
_c$49.00 ($55.00 for 3 1/2 in. disk)
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