SILVIANA, Nurvia; MIFTAKH, Fauzi. Activating students’ cognitive perspective using problem based learning in Efl speaking class. Journal of Applied Studies in Language, [S.l.], v. 5, n. 1, p. 147-155, june 2021. ISSN 2615-4706. Available at: <http://ojs.pnb.ac.id/index.php/JASL/article/view/2382>. Date accessed: 26 may 2022. doi: http://dx.doi.org/10.31940/jasl.v5i1.2382.