Mahmud al-Kashgari's Dīwān Lughāt al-Turk and Yūsuf Balasaguni's Kutadgu Bilig are considered to be important literary works written in Karakhanid language.
According to Ligeti's classification, it is divided into three periods: Ḥāqāni Turkic (Khāghānī/Khāqānī Türkī) can also be called the Old Kashgar language.
They are: Turkic elders valued the native language and left 21 works.
[5] The most important and valuable of these that have reached our hands are; The famous work Kutadgu Bilig written by Yusuf Has Hajip (Yūsuf Khāss Hājib), which was written in Karakhanid Turkic for the first time during the Karakhanid State, and the famous work Divān-ı Lügati't-Türk written in the same century by Kāshgarlı Mahmud.
Unfortunately, four works mentioned by Ibn Muhannā, one work called Bilik mentioned by Abu Hayyan (Abū Mūsā Ǧābir ibn Ḥayyān) and others have not been found.