Ledwani, Lalita, et al. “Anthraquinone Glycoside from Stem Bark of Cassia Reingera and Use of Aqueous Bark Extracts As An Eco-Friendly Natural Dye on Wool”. Asian Journal of Chemistry, vol. 21, no. 7, Mar. 2010, pp. 5179-83, https://asianpubs.org/index.php/ajchem/article/view/18290.