LUMBANGAOL, R. R.; NASUTION, P. .; GULO, B. .; HASIBUAN, M. F. . Meningkatkan Kosa Kata Bahasa Inggris Para Guru Yayasan Ghafa Melalui Permainan Spelling Bee . JURNAL ABDIMAS MADUMA, [S. l.], v. 1, n. 2, p. 43–49, 2023. DOI: 10.52622/jam.v1i2.126. Disponível em: https://journal.eltaorganization.org/index.php/ecdj/article/view/126. Acesso em: 19 apr. 2026.