Jaenudin, D., A. Arif Amin, M. Agus Setiadi, H. Sumarno, and S. Rahayu. “Sustainability Status of Dairy Farms in Bogor District Area, Indonesia”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 34, no. 2, June 2017, pp. 34-53, https://www.gssrr.org/index.php/JournalOfBasicAndApplied/article/view/7600.