T. K, M. M, and V. P, “Efficacy of the plant products Acorus calamus, Piper longum, and Econeem against the Larvae of Tobacco Caterpillar Spodoptera litura Fab. (Lepidoptera: Noctuidae)”, J. Res. Bio, vol. 1, no. 7, pp. 490-493, Nov. 2011.