| ISO 639-3 | art-001 |
| ret | |
| ISO 639-3 Reference Names | art-289 | Retta |
| ISO 639-3 Print Names | art-290 | Retta |
| ISO 639-3 Inverted Names | art-291 | Retta |
| Ethnologue Primary Language Names | art-323 | Reta |
| Glottolog Languoid Names | art-326 | Retta |
| Glottocode | art-327 | rett1240 |
| Glottolog Primary Key | art-328 | 33740 |
| Ethnologue Language Names | art-330 | Reta |
| Ethnologue Language Names | art-330 | Retta |
| English | eng-000 | Retta |