Suharjono, Sigit, and Dewi Ratnaningsih. “Grammatical Competence of A 3;6-Year-Old Bo: A Case Study”. Edukasi Lingua Sastra 20, no. 2 (September 29, 2022): 115–136. Accessed December 1, 2022. https://jurnal.umko.ac.id/index.php/elsa/article/view/565.