SITORUS, Sabatini; SIREGAR, Masitowarni. IMPROVING GRADE V STUDENTS™ VOCABULARY ACHIEVEMENT THROUGH FLASH CARDS. TRANSFORM : Journal of English Language Teaching and Learning, North Sumatera, Indonesia, v. 2, n. 1, 2013. DOI: 10.24114/tj.v2i1.903. Disponível em: https://jurnal.unimed.ac.id/2012/index.php/jelt/article/view/903. Acesso em: 3 jul. 2025.