Patchanee Chaiyawat และ D.G. Bottrell E.N. Bernardo. (2001) The Effect of Silica in Rice on the Brown Planthopper, Nilaparvata lugens (Stal). <i>Thai Agricultural Research Journal</i>, <i>19</i>(3), 196-211.Patchanee Chaiyawat และ D.G. Bottrell E.N. Bernardo. "The Effect of Silica in Rice on the Brown Planthopper, Nilaparvata lugens (Stal)". Thai Agricultural Research Journal 19 (2001):196-211.Patchanee Chaiyawat และ D.G. Bottrell E.N. Bernardo. The Effect of Silica in Rice on the Brown Planthopper, Nilaparvata lugens (Stal). Department of Agriculture:ม.ป.ท. 2001.