JULISTIANA, R. “THE RESEARCH OF CHILD LANGUAGE ACQUISITION AGE OF THREE”. Biormatika : Jurnal Ilmiah Fakultas Keguruan Dan Ilmu Pendidikan, vol. 4, no. 02, Oct. 2018, pp. 200-17, https://ejournal.unsub.ac.id/index.php/FKIP/article/view/302.