Taagepera، Rein (1979). "Size and Duration of Empires: Growth–Decline Curves, 600 BC to 600 AD". Social Science History. Social Science History, Vol. 3, No. 3/4. ج. 3 ع. 3/4: 115–138 [125]. DOI:10.2307/1170959. JSTOR:1170959.
jstor.org
Taagepera، Rein (1979). "Size and Duration of Empires: Growth–Decline Curves, 600 BC to 600 AD". Social Science History. Social Science History, Vol. 3, No. 3/4. ج. 3 ع. 3/4: 115–138 [125]. DOI:10.2307/1170959. JSTOR:1170959.
stanford.edu
web.stanford.edu
Kron, Geoffrey (2012), Scheidel, W. (ed.), Food Production(see p. 8, fn 72) from The Cambridge Companion to the Roman Economy Cambridge: Cambridge University Press: 156–174 نسخة محفوظة 2021-02-25 على موقع واي باك مشين.
web.archive.org
Kron, Geoffrey (2012), Scheidel, W. (ed.), Food Production(see p. 8, fn 72) from The Cambridge Companion to the Roman Economy Cambridge: Cambridge University Press: 156–174 نسخة محفوظة 2021-02-25 على موقع واي باك مشين.