COUSINS, J. M.; PETERSON, M. J.; CHRISTOPHER, A. N.; FRANCIS, A. P.; BETZ, H. H. Grit-passion and grit-perseverance in ultramarathon runners. Journal of Human Sport and Exercise, [S. l.], v. 16, n. 4, p. 965–972, 2021. DOI: 10.14198/jhse.2021.164.18. Disponível em: https://www.jhse.ua.es/article/view/2021-v16-n4-grit-passion-grit-perseverance-ultramarathon-runners. Acesso em: 7 may. 2024.