RYAN, W. L. INCOHERENCE AND CONTRADICTION IN THE VALUES CLARIFICATION MOVEMENT. McGill Journal of Education / Revue des sciences de l’éducation de McGill, Montreal, QC, v. 24, n. 002, 1989. Disponível em: https://mje.mcgill.ca/article/view/7864. Acesso em: 9 dec. 2021.