Światlak, Kalina, Wiktoria Żelazna, and Justyna Trzaskalik. “Melancholy in the Microbiome: Decoding the Gut-Brain Axis in Major Depression – A Systematic Review”. Journal of Education, Health and Sport 95 (September 25, 2026). Accessed September 25, 2026. https://apcz.umk.pl/JEHS/article/view/74083.