SIHOMBING, Pdt. Partohap S.R. The Effect of using Jumble Letters in Teaching Vocabulary in Grade Eight Students of SMP Negeri 7 Pematangsiantar. International Journal of English Literature and Social Sciences (IJELS), [S. l.], v. 4, n. 1, 2019. Disponível em: https://journal-repository.com/index.php/ijels/article/view/408.. Acesso em: 22 jul. 2024.