Łuczyk, R.J., Deryło, K., Łuczyk, M., Wawryniuk, A. and Sikora, K. 2021. Stress level and ways of coping with stress in a group of patients with unstable coronary heart disease. Journal of Education, Health and Sport. 11, 6 (Jun. 2021), 164–169. DOI:https://doi.org/10.12775/JEHS.2021.11.06.017.