Öztürk, Özhan, Pontus: Antik Çağ'dan Günümüze Karadeniz'in Etnik ve Siyasi Tarihi. Genesis Yayınları (2011). Gearchiveerd op 27 april 2015. Geraadpleegd op 6 december 2019. "... Greek term Tourkoi first used for the Khazars in 568 AD. In addition in "De Administrando Imperio" Hungarians call Tourkoi too once known as Sabiroi ..."