Fajrona, Kadran, et al. “Optimizing The Use of Fermented Palm Kernel Cake in Feed by Giving Humic Acid in Drinking Water on Broiler Performance”. Andalasian Livestock, vol. 2, no. 2, July 2025, pp. 107-12, doi:10.25077/alive.v2.n2.p107-112.2025.