Khalida, Rahmi. “DESCRIPTION OF THE EFFORTS OF PARENTS WITH DOWN SYNDROME CHILDREN ON DEVELOPMENT OF FIRST LANGUAGE ACQUISITION: -”. JURNAL KESEHATAN MERCUSUAR 2, no. 2 (Desember 30, 2019). Diakses Oktober 12, 2025. https://jurnal2.mercubaktijaya.ac.id/index.php/mercusuar/article/view/49.