Saragih, R. ., Hutabarat, E. ., Silalahi, J. ., Purba, H. P. . and Pasaribu, A. G. . (2024) “Pastoral Ecology With Umpasa Cultural Approach In Batak Land”, Migration Letters. London, UK, 21(S6), pp. 682–690. Available at: https://migrationletters.com/index.php/ml/article/view/7982 (Accessed: 27July2024).