HEYSTEK, J.; LETHOKO, M. The contribution of teacher unions in the restoration of teacher professionalism and the culture of learning and teaching. South African Journal of Education, [S. l.], v. 21, n. 4, p. 222–227, 2006. DOI: 10.4314/saje.v21i4.24907. Disponível em: https://www.ajol.info/index.php/saje/article/view/24907. Acesso em: 7 oct. 2026.