Коloskova O. K., T. M. Bilous, G. A. Bilyk, S. S. Kaliyeva, V. P. Riklefs, G. Z. Abakassova, and A. Z. Muratova. 2018. “Efficacy of Teaching Medical Students by Problem-Based Learning Method”. Journal of Education, Health and Sport 8 (8):1217-26. https://apcz.umk.pl/JEHS/article/view/6169.