Laksana IPY, Yuliantini NN, Suciani NK, Purandina IPY, Boyce GP. Employing e-portfolio based learning in improving self-efficacy of student’s speaking ability . JASL [Internet]. 2021 Dec. 7 [cited 2024 Nov. 22];5(2):229-36. Available from: https://ojs2.pnb.ac.id/index.php/JASL/article/view/22