GAŁĄZKA, Jakub Krzysztof. The impact of Bacillus Calmette-Guérin (BCG) vaccination on the course of COVID-19: effectiveness and possible mechanism. Journal of Education, Health and Sport. Online. 8 October 2022. Vol. 12, no. 10, pp. 132-142. [Accessed 8 July 2025]. DOI 10.12775/JEHS.2022.12.10.016.