M.F, Safian, Mohamad Ali N.A, Yury , N, and Zainal Ariffin Z. 2005. “Identification of Essential Oil Composition of Peel and Fruits of Citrus Hystrix DC”. Malaysian Journal of Science 24 (1):109-11. http://mojes.um.edu.my/index.php/MJS/article/view/8941.