HUSAIN, H. Upaya membantu guru membuat e-ulangan melalui metode SHOPING menggunakan whatsapp. Indonesian Journal of Educational Development (IJED), [S. l.], v. 1, n. 4, p. 544–555, 2021. DOI: 10.5281/zenodo.4559684. Disponível em: https://ojs.mahadewa.ac.id/index.php/ijed/article/view/814. Acesso em: 21 aug. 2025.