Putri, I., Widayati, W. and Tobing, V. M. T. (2020) “Pemerolehan Kosakata Anak Down Syndrome Berdasarkan Kelas Kata Bahasa Indonesia di SLB C1 AKW Kumara 1 Surabaya: The Acquisition of Vocabulary in Down Syndrome Children Based on Word Classes in Indonesian Language at C1 AKW Kumara 1 Special School Surabaya”, Wacana : Jurnal Bahasa, Seni, dan Pengajaran, 4(1), pp. 22-28. doi: 10.29407/jbsp.v4i1.14783.