KALININ, R., BALÁZSI, R., PÉNTEK, I., & HANȚIU, I. (2021). RELATIONSHIP BETWEEN MENTAL TOUGHNESS, STRESS, ANXIETY AND DEPRESSION. Studia Universitatis Babeș-Bolyai Educatio Artis Gymnasticae, 66(1), 17–24. https://doi.org/10.24193/subbeag.66(1).02