Abdullah, F., S. Partiban, and F. Abdullah. “Feeding Stimulant for Epilachna Indica (Coleoptera: Coccinellidae) from the Leaf Surface of Solanum Melongena”. Malaysian Journal of Science, vol. 22, no. 2, Aug. 2003, pp. 1-10, http://mojes.um.edu.my/index.php/MJS/article/view/8506.