BR MUNTHE, Sinthya Maranatha; TAMPUBOLON, Sahlan; NAPITUPULU, Fenty Debora. The Effect of Applying Hello English Application on Students’ Vocabulary Mastery of the Second Grade at SMA Swasta HKBP Sidorame. Innovative: Journal Of Social Science Research, [S. l.], v. 4, n. 3, p. 1855–1866, 2024. DOI: 10.31004/innovative.v4i3.10719. Disponível em: https://j-innovative.org/index.php/Innovative/article/view/10719. Acesso em: 14 jun. 2026.