- Glottolog: http://glottolog.org/resource/languoid/id/arch1244 - Wikipedia: https://ru.wikipedia.org/wiki/%D0%90%D1%80%D1%87%D0%B8%D0%BD%D1%81%D0%BA%D0%B8%D0%B9_%D1%8F%D0%B7%D1%8B%D0%BA