“Effect of Ammonium Sulphate on the Sporulation of Bacillus Thuringiensis Subsp. Aizawai SN2 (a Local Isolate) During Batch Fermentation”. Jurnal Teknologi, vol. 39, no. 1, Jan. 2012, p. 53–60, https://doi.org/10.11113/jt.v39.455.