D. Wicaksana, S. Hidanah, W. P. Lokapirnasari, M. A. Al-Arif, M. Lamid, and K. Suprianondo, “Administration of Palm Kernel Meal and íŸ-Mannanase on Laying Hens Productivity”, J. Med. Vet., vol. 4, no. 1, pp. 72–77, Apr. 2021.