1. Ahmed OH, Husni MHA, Awang Noor AG, Hanafi MM. 2002. The removal and burning pineapple residue in pineapple cultivation on tropical peat: An Economic Viability Comparison. Pertanika Journal of Tropical Agricultural Science, 25, 47–51.
2. American Society of Agricultural Engineers (ASAE). 2008. Method of determining and expressing fineness of feed materials by sieving. American Society of Agricultural and Biological Engineers, St. Joseph, Michigan, USA.
3. Andriani Y, Safitri R, Abun. 2015. Improvement protein quality of cassava peel by solid substrate fermentation using cellulolytic microbial consortium. Scientific Papers-Animal Science Series: Lucrări Ştiinţifice-Seria Zootehnie, 63, 250–253.
4. Angumeenal AR, Venkappayya D. 2013. An overview of citric acid production. Food Science and Technology, 50, 367–370.
5. Association of American Feed Control Officials (AAFCO). 2014. Feed inspector’s manual, 5th ed. Association of American Feed Control Officials Inspection and Sampling Committee, Champaign, IL.