HARTMAN, Robert S. Lecture II: The Concept of the Science of Value. Journal of Formal Axiology: Theory and Practice, [S. l.], v. 10, p. 9–18, 2017. DOI: 10.67945/jfa.v10i.150. Disponível em: https://journal.hartmaninstitute.org/index.php/jfa/article/view/150. Acesso em: 13 nov. 2026.