T. . Hermanto, M. Mairizal, and Y. Yusrizal, “Protein efficiency ratio in broiler fed hydrolyzed palm kernel meal-based rations using mannase and cellulase enzymes”, J. Ilmu Peternak. dan Vet. Trop. (Journal Trop. Anim. Vet. Sci.), vol. 14, no. 4, pp. 156–164, Dec. 2024.