| ISO 639-2/T | art-002 |
| chu | |
| ISO 639-3 | art-001 | chu |
| ISO 639-2/B | art-003 | chu |
| ISO 639-1 | art-004 | cu |
| ISO 639-3 Reference Names | art-289 | Church Slavic |
| ISO 639-3 Print Names | art-290 | Church Slavic |
| ISO 639-3 Print Names | art-290 | Church Slavonic |
| ISO 639-3 Print Names | art-290 | Old Bulgarian |
| ISO 639-3 Print Names | art-290 | Old Church Slavonic |
| ISO 639-3 Print Names | art-290 | Old Slavonic |
| ISO 639-3 Inverted Names | art-291 | Bulgarian, Old |
| ISO 639-3 Inverted Names | art-291 | Slavic, Church |
| ISO 639-3 Inverted Names | art-291 | Slavonic, Church |
| ISO 639-3 Inverted Names | art-291 | Slavonic, Old |
| ISO 639-3 Inverted Names | art-291 | Slavonic, Old Church |