Zharkenova, A.M. “The Polyethnic Composition of the Population of Northern Kazakhstan in the Late XIX–XXІ Centuries: Historical Features, Current Trends and Prospects ”. Bulletin of the Karaganda University History. Philosophy Series, vol. 92, no. 4, Dec. 2018, pp. 60-69, https://ejh.buketov.edu.kz/history-philosophy-vestnik/article/view/402.