Khieokhajonkhet, A., and Surapon, K. “Effects of fish protein hydrolysate on the growth performance, feed and protein utilization of Nile tilapia (Oreochromis niloticus)”. International Journal of Agricultural Technology, vol. 16, no. 3, May 2020, pp. 641-54, https://li04.tci-thaijo.org/index.php/IJAT/article/view/7008.