Taagepera, Rein (1979). „Size and Duration of Empires: Growth–Decline Curves, 600 BCE to 600 CE“. Social Science History. Social Science History, Vol. 3, No. 3/4. 3 (3/4): 115–138. doi:10.2307/1170959. ISSN0145-5532. JSTOR1170959.
jstor.org
Taagepera, Rein (1979). „Size and Duration of Empires: Growth–Decline Curves, 600 BCE to 600 CE“. Social Science History. Social Science History, Vol. 3, No. 3/4. 3 (3/4): 115–138. doi:10.2307/1170959. ISSN0145-5532. JSTOR1170959.
worldcat.org
Taagepera, Rein (1979). „Size and Duration of Empires: Growth–Decline Curves, 600 BCE to 600 CE“. Social Science History. Social Science History, Vol. 3, No. 3/4. 3 (3/4): 115–138. doi:10.2307/1170959. ISSN0145-5532. JSTOR1170959.