Setiadji, Bambang. “Pengembangan Usaha Peternakan Sapi Perah Rakyat Kasus Cangkringan Yogyakarta”. Unisia, no. 21 (July 20, 2016): 98–104. Accessed November 21, 2024. https://journal.uii.ac.id/Unisia/article/view/5375.