Hamzah, M., and M. A. Yeop. “Frog VLE (persekitaran Pembelajaran Maya) Dalam Pengajaran Dan Pembelajaran: Penerimaan Dan Kaedah pelaksanaannya**”. Journal of Research, Policy & Practice of Teachers and Teacher Education, vol. 6, no. 2, Oct. 2018, pp. 67-77, https://ejournal.upsi.edu.my/index.php/JRPPTTE/article/view/227.