Uba, G., M. Bala, M. M. Abdullah, M. N. F. Saat, B. Gunasekaran, and M. Y. Shukor. “The Application of Crude Ginger Protease As an Inhibitive Assay for Heavy Metals”. Journal of Environmental Microbiology and Toxicology, vol. 7, no. 1, July 2019, pp. 48-53, doi:10.54987/jemat.v7i1.472.