Bulgarians and Khazara, Eastern neighbors of Russia with Vladimir Sv.

Golubovsky, Peter Vasilyevich (1857-1907).Bulgarians and Khazara, Eastern neighbors of Russia with Vladimir Sv.: (East-ethnogr. Essay) / P. Golubovsky.- Kiev, 1888. -43 s .. -Bibliogr.In notes .. - OTT.From "Kiev. Starny".- without tit.l..I. Vladimir Svyatoslavich I (CN; -1015).Electronic Source: PB