ELVIRA, E.; SURADI, A.; JUNI ASTUTI, D. P. Comparative Analysis of Spoken Language Use in Formal and Non-Formal Communication: A Study of Eighth-Grade Students at MTsN 1 Mukomuko, Indonesia. JPI : Jurnal Pustaka Indonesia, v. 4, n. 2, p. 93-100, 21 Jul. 2024.