020 - International Standard Book Number (R)

First IndicatorSecond Indicator
Undefined
# - UndefinedUndefined
# - Undefined




Subfield Codes

$a - International Standard Book Number (NR)
$c - Terms of availability (NR)
$q - Qualifying information (R)


$z - Canceled/invalid ISBN (R)
$6 - Linkage (NR)
$8 - Field link and sequence number (R)





FIELD DEFINITION AND SCOPE



International Standard Book Number (ISBN) assigned to a