Peter B. Golden: "Ethnogenesis in the Tribal Zone: The Shaping of the Türks". In: Archivum Eurasiae Medii Aevi 16, 2011, S. 5–7 (Reprinted with addenda in Peter B. Golden, Studies on the Peoples and Cultures of the Eurasian Steppes, ed. C. Hriban, Florilegium magistrorum historiae archaeologicaeque Antiquitatis et Medii Aevi, IX (Bucharest-Brăla 2011): Seiten 17-64): “It is not unlikely that some of the peoples who appear in the Greek sources as “Scythians” and as “Saka” in Old Persian may have been speakers of other, non-Iranian languages who were included in the polyglot confederations typical of the Eurasian steppe world. These may have included Turkic-speakers who had come westward.”
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Bernhard Munkácsi, "Die Bedeutung des Namens der Türken", in: Gyula Németh, Kőrösi Csoma-Archivum, Band 1. (1921–1925), H. Lafaire, Leiden Brill, Neuauflage 1967, S. 59 ff.
Peter B. Golden: "Ethnogenesis in the Tribal Zone: The Shaping of the Türks". In: Archivum Eurasiae Medii Aevi 16, 2011, S. 5–7 (Reprinted with addenda in Peter B. Golden, Studies on the Peoples and Cultures of the Eurasian Steppes, ed. C. Hriban, Florilegium magistrorum historiae archaeologicaeque Antiquitatis et Medii Aevi, IX (Bucharest-Brăla 2011): Seiten 17-64): “It is not unlikely that some of the peoples who appear in the Greek sources as “Scythians” and as “Saka” in Old Persian may have been speakers of other, non-Iranian languages who were included in the polyglot confederations typical of the Eurasian steppe world. These may have included Turkic-speakers who had come westward.”