Ybyrajhan, M.Y., and K.S. Uskembaev. “The Situation of Workers of the Central Kazakhstan Mining and Metallurgical Industry Late Nineteenth and Early Twentieth Centuries”. Bulletin of the Karaganda university History. Philosophy series 86, no. 2 (June 30, 2017): 81–89. Accessed September 27, 2026. https://ejh.buketov.edu.kz/history-philosophy-vestnik/article/view/217.