Ko Ko. (2009) Insecticidal activities of three essential oils against Sitophilus zeamais Motschulsky and Tribolium castaneum (Herbst) /. Kasetsart University,:ม.ป.ท.Ko Ko. 2009. Insecticidal activities of three essential oils against Sitophilus zeamais Motschulsky and Tribolium castaneum (Herbst) /. ม.ป.ท.:Kasetsart University,;Ko Ko. Insecticidal activities of three essential oils against Sitophilus zeamais Motschulsky and Tribolium castaneum (Herbst) /. ม.ป.ท.:Kasetsart University, 2009. Print.