M.F, S., M. Ali N.A, Y. , N, and Z. Ariffin Z. “Identification of Essential Oil Composition of Peel and Fruits of Citrus Hystrix DC”. Malaysian Journal of Science, vol. 24, no. 1, Jan. 2005, pp. 109-11, http://mojes.um.edu.my/index.php/MJS/article/view/8941.