Shormin, T, and M G Kibria. “Effects of Biogas Digestate from Cowdung and Poultry Manure on Growth and Yield of Spinach (SpinaceaoleraceaL.)”. Chittagong University Journal of Biological Sciences, vol. 9, no. 1, June 2024, pp. 19-28, doi:10.3329/cujbs.v9i1.73762.