Nasha Emieza Ruhaizat, et al. “Experimental the Influence of Growth Solution on Zinc Oxide Crystal Structures via Hydrothermal Method”. International Journal of Integrated Engineering, vol. 13, no. 2, Dec. 2020, pp. 222-8, https://publisher.uthm.edu.my/ojs/index.php/ijie/article/view/7646.