Ushie, O., H. Adamu, and I. Chindo. “β – Amyrin-3- Acetate Detected in Methanolic Leaf Extract of Chrysophyllum Albidium”. Journal of Chemical Society of Nigeria, vol. 43, no. 2, Apr. 2018, http://www.journals.chemsociety.org.ng/index.php/jcsn/article/view/166.