Hasibuan, A. S., L. D. Mahfudz, and T. A. Sarjana. “Efek Perbedaan Dataran Terhadap Kualitas Litter Closed House Ayam Broiler”. Jurnal Sain Peternakan Indonesia, vol. 16, no. 2, June 2021, pp. 171-9, https://ejournal.unib.ac.id/jspi/article/view/12347.