Kayirken, T. . . “Union of Naymans and Merkits in the 13th Century”. Bulletin of L.N. Gumilyov Eurasian National University. Historical Sciences. Philosophy. Religious Studies, vol. 130, no. 1, Mar. 2020, pp. 35-49, doi:10.32523/2616-7255-2020-130-1-35-49.