W. Aengwanich and T. Boonsorn, “Effect of Tannic Acid Extracted from Cassava (Manihot esculenta Crantz) Leaves on Productive Performance, Intestinal Microorganisms and Villi Morphometry in Broilers: A Preliminary Study”, Int. J. Poult. Sci., vol. 16, no. 2, pp. 50–55, Jan. 2017, doi: 10.3923/ijps.2017.50.55.