Singam, Rupashinii Thana, et al. “The Preparation and Characterization on Natural Dyes Based on Neem, Henna and Turmeric for Dyeing on Cotton With Superhydrophobic Coating”. International Journal of Integrated Engineering, vol. 11, no. 7, Nov. 2019, pp. 137-43, https://penerbit.uthm.edu.my/ojs/index.php/ijie/article/view/5085.