R. I. . ABD AZIZ, F. A. . AHMAD MAFAKHIR, N. E. . BADARUDIN, and N. . MUHAMMAD SHARIF, “THE PRIVATE OPTOMETRY PRACTICES IN MALAYSIA: THE PROFESSIONAL SERVICES”, Inter. J. All. Heal. Sci., vol. 4, no. 1, pp. 1074–1091, Feb. 2020.