The Effect of the Problem Based Learning on EFL Learners’ Achievement. Journal Of Educational and Psychological Researches, [S. l.], v. 12, n. 44, p. 367–386, 2015. Disponível em: https://www.jperc.uobaghdad.edu.iq/index.php/jperc/article/view/450. Acesso em: 5 jul. 2025.