C. S. W, C., Lau, S., Husaini, A.S., Zulkharnain, A., Apun, K., Bilung, L.M. and Vincent, M. 2014. Identification of methane-producing bacteria from palm oil mill sludge (POMS) with solid cud from ruminant stomach. Journal of Biochemistry, Microbiology and Biotechnology. 2, 1 (Jul. 2014), 23–26. DOI:https://doi.org/10.54987/jobimb.v2i1.125.