Naqqash, S., F. Asad, and S. S. Pal. “Efficacy and Safety of Azathioprine in the Treatment of Chronic Actinic Dermatitis”. Journal of Pakistan Association of Dermatologists, vol. 20, no. 4, Dec. 2016, pp. 222-6, doi:10.66344/jpad.20.4.2010.381.