NURYANINGSIH. THE ROLE OF PARENTS IN THE DEVELOPMENT OF MENTALLY RETARDED CHILDREN AT SLBN ANGKOLA TIMUR, SOUTH TAPANULI. European Journal of Research Development and Sustainability, [S. l.], v. 2, n. 12, p. 136-138, 2021. Disponível em: https://scholarzest.com/index.php/ejrds/article/view/1626. Acesso em: 8 nov. 2024.