SANZ PONCE, Roberto; MULA BENAVENT, José M. Education in values program. Moral formation in secondary education students. Revista de Investigaciones UNAD, Colombia,CO, v. 12, n. 1, p. 159–182, 2013. DOI: 10.22490/25391887.1165. Disponível em: https://hemeroteca.unad.edu.co/index.php/revista-de-investigaciones-unad/article/view/1165. Acesso em: 6 nov. 2026.