Shamsuddin, S., and T. S. Haroon. “Comparative Study of Psoralen-UVB Vs. UVB-Alone Therapy in the Treatment of Psoriasis”. Journal of Pakistan Association of Dermatologists, vol. 13, no. 2, Jan. 2017, pp. 55-61, https://www.jpad.com.pk/index.php/jpad/article/view/732.