Mamat, N. Z. ., S. R. S. . Abdullah, H. A. Hasan, N. ‘Izzati . Ismail, and S. S. N. . Sharuddin. “Polishing of Treated Palm Oil Mill Effluent Using Azolla Pinnata”. Journal of Biochemistry, Microbiology and Biotechnology, vol. 10, no. SP2, Dec. 2022, pp. 40-45, doi:10.54987/jobimb.v10iSP2.727.