Wahamaji
Kradin, Nikolay (2004). "Nomadic Empires in Evolutionary Perspective". In Alternatives of Social Evolution. Ed. by N.N. Kradin, A.V. Korotayev, Dmitri Bondarenko, V. de Munck, and P.K. Wason (pp. 274–88). Vladivostok: Far Eastern Branch of the Russian Academy of Sciences; reprinted in: The Early State, its Alternatives and Analogues. Ed. by Leonid Grinin et al. (pр. 501–24). Volgograd: Uchitel'.