Sethi, Sadia, et al. “REFRACTIVE ERRORS IN CHILDREN ATTENDING OUT-PATIENT DEPARTMENT OF OPHTHALMOLOGY, KHYBER TEACHING HOSPITAL, PESHAWAR: Refractive Errors in Children”. Pakistan Armed Forces Medical Journal, vol. 58, no. 4, Dec. 2008, pp. 424-8, https://pafmj.org/PAFMJ/article/view/1963.