L. Kazbekova, K. Utegenova, A. Akhmetova, и Z. Korzhynbayeva. «THE ESSENCE AND TYPES OF COMPETITIVE STRATEGIES». Academic Journal of Physical and Chemical Sciences, no. 6 (декабрь 12, 2019): 150–157. просмотрено декабрь 13, 2025. http://89.250.84.46/reports-science/article/view/1809.