BYRUM, C. Stephen. A Unified Field Theory of Motivation: Based on the work of Robert S. Hartman. Journal of Formal Axiology: Theory and Practice, [S. l.], v. 4, p. 13–52, 2011. DOI: 10.67945/jfa.v4i.89. Disponível em: https://journal.hartmaninstitute.org/index.php/jfa/article/view/89. Acesso em: 12 nov. 2026.