Mala, M. et al. 2012. Residual effect of two insecticides and neem oil against epilachna beetle, Epilachna vigintioctopunctata (Fab.) on bitter gourd. Journal of the Bangladesh Agricultural University. 10, 1 (Oct. 2012), 21–25. DOI:https://doi.org/10.3329/jbau.v10i1.12034.