Atan, M.S., K.A. Dzulkefly, S. Mohd Aspollah, K. Anuar, and S. Vijay. 2011. “Isolation and Antibacterial Activity of Alkaloids from Phaeanthus Opthalmicus”. Asian Journal of Chemistry 23 (9):3824-26. https://asianpubs.org/index.php/ajchem/article/view/10769.