-Yang Lee, Chow, Han -Heng Yap, and Ngo- Long Chong. 1996. “Insecticide Toxicity on the Adult German ceki’oach, Blattella Germanica (L.) (Dictyoptera: Blattellidae)”. Malaysian Journal of Science 17 (1):1-9. https://ejournal.um.edu.my/index.php/MJS/article/view/9400.