Gaya, Umar, and Sa'adatu Abdul-Aziz Umar. “Optimised Photocatalytic Degradation of Crystal Violet Over 1wt% MgO-ZnO Composite Catalyst”. Journal of Science and Technology, vol. 11, no. 1, June 2019, pp. 25-33, https://publisher.uthm.edu.my/ojs/index.php/JST/article/view/4297.