Br Sembiring, F. E. D. R., Tengku Syarfina and Sekar Azzahra (2024) “Comparison of the Vowel Formant Measurements in Karo and Simalungun Language”, JADEs Journal of Academia in English Education, 5(1), pp. 105-118. doi: 10.32505/jades.v5i1.8745.