Wizna, Abbas H, Rizal Y, Dharma A, Kompiang IP. Improving the Quality of Tapioca By-Products (Onggok) as Poultry Feed Through Fermentation by Bacillus amyloliquefaciens . Pak. J. Nutr. 2009;8(10):1636–1640. doi:10.3923/pjn.2009.1636.1640