Khoomsab, R., and K. Khoomsab. “Extraction and Determination of Anthraquinone from Herbal Plant As Bird Repellent”. Science & Technology Asia, vol. 24, no. 1, Feb. 2019, pp. 14-20, https://ph02.tci-thaijo.org/index.php/SciTechAsia/article/view/171195.