Sara, U., M. Azhar, M. I. Aryawiguna, M. Musarianto, and M. I. Risanta. “Effect of Activated Carbon from Coconut Shells on Ammonia Concentration in Laying Hen Manure”. JURNAL ILMIAH PETERNAKAN TERPADU, vol. 13, no. 2, July 2025, pp. 449-61, doi:10.23960/jipt.v13i2.p449-461.