Harianto II, Harianto II, Teguh Satria Amin, and Zulfitri Zulfitri. 2020. “PHONOLOGICAL STUDY OF MANDAILING AND ANGKOLA LANGUAGES IN NORTH SUMATRA ”. Jurnal Educatio FKIP UNMA 6 (2):729-39. https://doi.org/10.31949/educatio.v6i2.690.