Erdal, Marcel (1993)Die Sprache der wolgabolgarischen Inschriften (in German), Wiesbaden: Harrassowitz Verlag,→ISBN,page42
Róna-Tas, András (1976) “A Volga Bulgarıan Inscription from 1307”, inActa Orientalia Academiae Scientiarum Hungaricae[1] (in Bulgar), volume30, number 2, page155
Tekin, Talât (1988)Volga Bulgar kitabeleri ve Volga Bulgarcası [Volga Bulgarian Ephitaphs and Volga Bulgarian Language][2] (in Turkish), Ankara: Türk Tarih Kurumu Basımevi,→ISBN