Sulimirski, Tadeusz (1970). The Sarmatians. Volume 73 of Ancient peoples and places. New York: Praeger. стр. 113—114. „The evidence of both the ancient authors and the archaeological remains point to a massive migration of Sacian (Sakas)/Massagetan tribes from the Syr Daria Delta (Central Asia) by the middle of the second century B.C. Some of the Syr Darian tribes; they also invaded North India.”
Taagepera, Rein (1979). „Size and Duration of Empires: Growth-Decline Curves, 600 B.C. to 600 A.D”. Social Science History. 3 (3/4): 115—138. JSTOR1170959. doi:10.2307/1170959.
Taagepera, Rein (1979). „Size and Duration of Empires: Growth-Decline Curves, 600 B.C. to 600 A.D”. Social Science History. 3 (3/4): 115—138. JSTOR1170959. doi:10.2307/1170959.
