Kwan Yuet Ping, Ibrahim Darah, Umi Kalsom Yusuf, Lachimanan Yoga Latha and Sreenivasan Sasidharan 2012. Standardization of Euphorbia hirta with Chemical Compounds Identification (GC-MS). International Journal of Phytomedicine. 4, 1 (Mar. 2012), 12–21.