Bgazhba, Khukhut Solomonovich (1967). Из истории письменности в Абхазии[From the History of Writing in Abkhazia](PDF) (in Russian). Tbilisi: Мецниереба. p.43. Archived from the original(PDF) on 15 June 2019. Retrieved 4 June 2020.
Bgazhba, Khukhut Solomonovich (1967). Из истории письменности в Абхазии[From the History of Writing in Abkhazia](PDF) (in Russian). Tbilisi: Мецниереба. p.43. Archived from the original(PDF) on 15 June 2019. Retrieved 4 June 2020.