N. I. Wardiana, W. P. Lokapirnasari, N. Harijani, M. A. Al-Arif, and A. Ardianto, “Bacillus subtilis Probiotics in Chicken Feed Improve Egg Quality with Differences in Shelf Life”, J. Med. Vet., vol. 4, no. 1, pp. 8–13, Apr. 2021.