ONG, Charito G. Development of Vocabulary Skills in Selected Second Year High School English Classes. JPAIR Multidisciplinary Research, Philippines, v. 3, n. 1, p. 13–25, 2009. DOI: 10.7719/jpair.v3i1.79. Disponível em: https://philair.org/index.php/jpair/article/view/79. Acesso em: 3 nov. 2025.