HARAHAP, Nova Jayanti; ARIFIN, Tina Mariany. IMPROVING GRADE VIII STUDENTS™ VOCABULARY ACHIEVEMENT THROUGH CONCEPT ATTAINMENT MODEL. TRANSFORM : Journal of English Language Teaching and Learning, North Sumatera, Indonesia, v. 2, n. 2, 2013. DOI: 10.24114/tj.v2i2.911. Disponível em: https://jurnal.unimed.ac.id/2012/index.php/jelt/article/view/911. Acesso em: 3 jul. 2025.