Akter, M, AK Chowdhury, and MAH Chowdhury. “Soil Organic Matter, Mineral Nutrients and Heavy Metals Status of Some Selected Regions of Bangladesh”. Journal of Environmental Science and Natural Resources 5, no. 2 (April 15, 2013): 01–09. Accessed October 17, 2021. https://www.banglajol.info/index.php/JESNR/article/view/14570.