Berta, Árpád. “Zwei Wolgabolgarische Lehnwörter in Der Mundart Der Getauften Tataren”. Studia Uralo-Altaica, vol. 17, Jan. 1982, pp. 14-19, https://ojs.bibl.u-szeged.hu/index.php/stualtaica/article/view/13516.