| MARC 21 FIELD TAG | MARC 21 SUBFIELD CODE | MARC 21 FIELD / SUBFIELD NAME | RDA INSTRUCTION NUMBER | RDA ELEMENT NAME |
| 020 | International Standard Book Number | |||
| 020 | a | International Standard Book Number | 2.15 | Identifier for the Manifestation |
| 020 | c | Terms of availability | 4.2 | Terms of Availability |
| 020 | z | Cancelled/invalid ISBN | 2.15 | Identifier for the Manifestation |
[Source : RDA Toolkit]
