Sultana, A., M. H. Munshi, .-. Md Kamruzzaman, A. F. Bari, and M. Issak. “Residual Effect of Raw Material of Chitosan Powder on Chemical Properties of Soil under Rice-Rice Cropping System”. Research in Agriculture Livestock and Fisheries, vol. 7, no. 1, Apr. 2020, pp. 33-42, doi:10.3329/ralf.v7i1.46829.