Hanifah, Hana, et al. “Pengujian Usabilitas User Experience Website Ubiquitous Based Learning Cloud Menggunakan Nielsen Model”. JSI: Jurnal Sistem Informasi (E-Journal), vol. 14, no. 1, Apr. 2022, pp. 2585-98, https://jsi.ejournal.unsri.ac.id/index.php/jsi/article/view/69.