SRIVASTAVA, CHIITRA, et al. “Toxicity of Various Insecticides Against Delhi and Palla Population Ofbrown Plant Hopper (Nilaparvata Lugens)”. The Indian Journal of Agricultural Sciences, vol. 79, no. 12, Jan. 2011, https://epubs.icar.org.in/index.php/IJAgS/article/view/2564.