Manaf, Mohd R.A., et al. “Cost-Effectiveness Analysis of Cataract Surgery With Intraocular Lens Implantation: Extracapsular Cataract Extraction Versus Phacoemulsification”. Medical Journal of Indonesia, vol. 16, no. 1, Feb. 2007, pp. 25-31, doi:10.13181/mji.v16i1.252.