“PENGARUH PENAMBAHAN SELENIUM DAN VITAMIN E TERHADAP PERFORMANS AYAM PETELUR PERIODE AFKIR”, STAP, vol. 5, pp. 124–128, May 2018, Accessed: Jan. 10, 2026. [Online]. Available: http://jnp.fapet.unsoed.ac.id/index.php/psv/article/view/441