Taagepera, Rein (1979). »Size and Duration of Empires: Growth-Decline Curves, 600 B.C. to 600 A.D.«. Social Science History. 3 (3/4): 129. doi:10.2307/1170959. JSTOR1170959.
Ross, E. Denison (1930). »The Orkhon Inscriptions: Being a Translation of Professor Vilhelm Thomsen's Final Danish Rendering«. Bulletin of the School of Oriental Studies, University of London. 5 (4): 861–76. doi:10.1017/S0041977X00090558. JSTOR607024. S2CID140199091.
Taagepera, Rein (1979). »Size and Duration of Empires: Growth-Decline Curves, 600 B.C. to 600 A.D.«. Social Science History. 3 (3/4): 129. doi:10.2307/1170959. JSTOR1170959.
Ross, E. Denison (1930). »The Orkhon Inscriptions: Being a Translation of Professor Vilhelm Thomsen's Final Danish Rendering«. Bulletin of the School of Oriental Studies, University of London. 5 (4): 861–76. doi:10.1017/S0041977X00090558. JSTOR607024. S2CID140199091.
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Ross, E. Denison (1930). »The Orkhon Inscriptions: Being a Translation of Professor Vilhelm Thomsen's Final Danish Rendering«. Bulletin of the School of Oriental Studies, University of London. 5 (4): 861–76. doi:10.1017/S0041977X00090558. JSTOR607024. S2CID140199091.