MOQBIL, Sara, NIEDOBYLSKI, Sylwiusz, LASZCZAK, Katarzyna, WARCHOŁ, Konrad and MIKOS, Eryk. The gut microbiota and mental health. Journal of Education, Health and Sport. Online. 18 September 2021. Vol. 11, no. 9, pp. 304-309. [Accessed 6 December 2023]. DOI 10.12775/JEHS.2021.11.09.037.