SARAGIH, R. .; HUTABARAT, E. .; SILALAHI, J. .; PURBA, H. P. .; PASARIBU, A. G. . Pastoral Ecology With Umpasa Cultural Approach In Batak Land. Migration Letters, London, UK, v. 21, n. S6, p. 682–690, 2024. Disponível em: https://migrationletters.com/index.php/ml/article/view/7982. Acesso em: 27 may. 2024.