พัฒนศร จ. Comparing the Effectiveness of Processing Instruction and Output-based Instruction in Acquiring the BE copula. Journal of Humanities and Social Sciences (HUSOKKU), Khon Kaen, Thailand, v. 33, n. 2, p. 1–31, 2016. Disponível em: https://so01.tci-thaijo.org/index.php/HUSO/article/view/71637. Acesso em: 16 sep. 2026.