Iskakuly, S., and S. Shortanbayev. “Characteristics of a Tough Epoch in the Dastans and Epic Poems”. Eurasian Journal of Philology: Science and Education, vol. 170, no. 2, Nov. 2018, pp. 69-74, https://philart.kaznu.kz/index.php/1-FIL/article/view/2213.