*Taagepera, Rein (1979). "Size and Duration of Empires: Growth-Decline Curves, 600 B.C. to 600 A.D.". Social Science History. 3 (3/4): 125. JSTOR1170959. डीओआइ:10.2307/1170959.
Turchin, Peter; Adams, Jonathan M.; Hall, Thomas D (December 2006). "East-West Orientation of Historical Empires". Journal of World-Systems Research. 12 (2): 222. आइ॰एस॰एस॰एन॰1076-156X. डीओआइ:10.5195/JWSR.2006.369.
jstor.org
*Taagepera, Rein (1979). "Size and Duration of Empires: Growth-Decline Curves, 600 B.C. to 600 A.D.". Social Science History. 3 (3/4): 125. JSTOR1170959. डीओआइ:10.2307/1170959.
Turchin, Peter; Adams, Jonathan M.; Hall, Thomas D (December 2006). "East-West Orientation of Historical Empires". Journal of World-Systems Research. 12 (2): 222. आइ॰एस॰एस॰एन॰1076-156X. डीओआइ:10.5195/JWSR.2006.369.
worldcat.org
*Taagepera, Rein (1979). "Size and Duration of Empires: Growth-Decline Curves, 600 B.C. to 600 A.D.". Social Science History. 3 (3/4): 125. JSTOR1170959. डीओआइ:10.2307/1170959.
Turchin, Peter; Adams, Jonathan M.; Hall, Thomas D (December 2006). "East-West Orientation of Historical Empires". Journal of World-Systems Research. 12 (2): 222. आइ॰एस॰एस॰एन॰1076-156X. डीओआइ:10.5195/JWSR.2006.369.