Young, E., and T. Tarawou. “Separation and Quantification of Anthraquinones in the Petiole, Leaves, and Roots of Water Hyacinth”. The International Journal of Science & Technoledge, vol. 4, no. 8, Aug. 2016, http://internationaljournalcorner.com/index.php/theijst/article/view/123964.