| Qualifier | citation |
| Definition | reference to a citation listed in the entry reference field |
| Value Format | [integer-number] where integer-number is the number of the reference as enumerated in the reference field |
| Example | /citation=[3] |
| Comment | not to be used for new entries from 14-MAY-2021;used to indicate the citation providing the claim of and/or evidence for a feature; brackets are used for conformity. |