Nessa, A, Shafiqur Rahmana, MTA Chowdhury, and Z Parveen. 2012. “Effects of Sewage Sludge at Different PH Levels on Ipomoea Aquatica”. Bangladesh Journal of Scientific and Industrial Research 47 (1):47-54. https://doi.org/10.3329/bjsir.v47i1.10721.