Pujiastuti, Y. et al. 2021. Effectivity of Bacillus thuringiensis from Soil in Freshwater Swamps against Epilachna sp. Larvae . Jurnal Lahan Suboptimal : Journal of Suboptimal Lands. 10, 1 (Apr. 2021), 46–53. DOI:https://doi.org/10.36706/JLSO.10.1.2021.531.