HURST, Clifford G. The Non-mathematical Logic of a Science of Values. Journal of Formal Axiology: Theory and Practice, [S. l.], v. 4, p. 1–12, 2011. DOI: 10.67945/jfa.v4i.88. Disponível em: https://journal.hartmaninstitute.org/index.php/jfa/article/view/88. Acesso em: 13 nov. 2026.