Chudzik, R., K. Jarosz, M. Gołębiowska, and B. Gołębiowska. “Stress Disease of the 21st Century?”. Journal of Education, Health and Sport, vol. 7, no. 8, Aug. 2017, pp. 20-26, https://apcz.umk.pl/JEHS/article/view/4674.