Damayanthi, Evy, . Yopi, Hasanatun Hasinah, Triana Setyawardani, Heni Rizqiati, and Salwa Putra. 2014. “Karakteristik Susu Kerbau Sungai Dan Rawa Di Sumatera Utara”. Jurnal Ilmu Pertanian Indonesia 19 (2): 67-73. https://journal.ipb.ac.id/JIPI/article/view/8799.