Lian, H. S., N. S. Safii, and N. Mohd Raus. “Development of Physical Activity Pyramid in Braille for Visually Impaired Adults”. Journal of Quran Sunnah Education & Special Needs, vol. 2, no. 1, June 2018, pp. 9-17, doi:10.33102/jqss.vol2no1.9.