Rein Taagepera (1979)۔ "Size and Duration of Empires: Growth-Decline Curves, 600 B.C. to 600 A.D."۔ Social Science History۔ 3 (3/4): 121۔ JSTOR1170959۔ doi:10.2307/1170959
jstor.org
Rein Taagepera (1979)۔ "Size and Duration of Empires: Growth-Decline Curves, 600 B.C. to 600 A.D."۔ Social Science History۔ 3 (3/4): 121۔ JSTOR1170959۔ doi:10.2307/1170959