Silaen SE, Ayu SF, Hanafi ND. Beef Cattle Breeder Income Improvement Strategy with Different Maintenance System in Langkat Regency. Rand. Inter. Social Sci. J. [Internet]. 2022Oct.31 [cited 2026Jun.27];3(4):878-90. Available from: https://www.randwickresearch.com/index.php/rissj/article/view/562