Low lexicostatistical percentages to other Eastern European sign languages and ASL in J. Albert Bickford (2005): 40-41 suggest it is independent but the table notably does not include Swedish and/or Finnish sign languages. Shaina Mahoney (2018) is a detailed comparison of Latvian and Estonian Sign but inconclusive regarding a special relationship between the two (since no other languages are included).
| Details | Name | Title | Any field | ca | Year | Pages | Doctype | ca | Provider | da |
|---|---|---|---|---|---|---|---|---|---|---|
Glottolog
[lsl] at ISO 639-3
[lsl] at OLAC
[lsl] at IMTVault
Wikidata
Wikipedia