Mustafa Wajdi , Khalida Muda, Nur Syamimi Zaidi , Mohd Hafiz Puteh , Mohamad Darwish , Ahmad Hanis Omar , Mohamad Faiz Mohd Amin, “Effect of Initial pH Adjustment on Acetogenic Treatment of Palm Oil Mill Effluent”, IJAST, vol. 29, no. 10s, pp. 602 - 607, May 2020.