BYRUM, C. Stephen. Exploring the Important Power of Focus. Journal of Formal Axiology: Theory and Practice, [S. l.], v. 2, p. 15–24, 2009. DOI: 10.67945/jfa.v2i.15. Disponível em: https://journal.hartmaninstitute.org/index.php/jfa/article/view/15. Acesso em: 13 nov. 2026.