Hutagalung, H.F., Husda, A. and Sembiring, R.A. 2024. UTILIZING MYSTERY BOX MEDIA TO IMPROVE ENGLISH SPEAKING PROFICIENCY AT MAYJEND SUTOYO SCHOOL. ELT (English Language Teaching Prima Journal). 6, 1 (Jun. 2024). DOI:https://doi.org/10.34012/elt.v6i1.5106.