Stepanov, T., & Stefanova, T. (2010). The Bulgars and the Steppe Empire in the Early Middle Ages: The problem of the others. Brill.
Chicago-čujuhus (17. p.)Stepanov, T͡Svetelin, juo Tati͡ana Stefanova. The Bulgars and the Steppe Empire in the Early Middle Ages: The Problem of the Others. Leiden [The Netherlands] ; Boston: Brill, 2010.
MLA-čujuhus (9. p.)Stepanov, T͡Svetelin, juo Tati͡ana Stefanova. The Bulgars and the Steppe Empire in the Early Middle Ages: The Problem of the Others. Brill, 2010.
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