Analysis of information sources in references of the Wikipedia article "Book of Dede Korkut" in English language version.
According to Lewis (1974), an older substratum of these oral traditions dates to conflicts between the ancient Oghuz and their Turkish rivals in Central Asia (the Pecheneks and the Kipchaks), but this substratum has been clothed in references to the 14th-century campaigns of the Akkoyunlu Confederation of Turkic tribes against the Georgians, the Abkhaz, and the Greeks in Trebizond.
According to Lewis (1974), an older substratum of these oral traditions dates to conflicts between the ancient Oghuz and their Turkish rivals in Central Asia (the Pecheneks and the Kipchaks), but this substratum has been clothed in references to the 14th-century campaigns of the Akkoyunlu Confederation of Turkic tribes against the Georgians, the Abkhaz, and the Greeks in Trebizond.