“Comparative Efficacy and Safety and Efficacy of Systemic 13-Cis Retinoic Acid 20mg Day Vs. 40mg Day in Acne Vulgaris”. Journal of Pakistan Association of Dermatologists 15, no. 3 (December 28, 2016): 238–241. Accessed July 27, 2026. https://www.jpad.com.pk/index.php/jpad/article/view/650.