EDI SUMARNO; GINTING, J. S.; KARINA, N.; LUBIS, M. A. R. The Factors in the Emergence of Smallholder Rubber Plantation in Tapanuli: 1906 - 1942. International Journal of Culture and Art Studies, [S. l.], v. 3, n. 1, p. 22–29, 2019. DOI: 10.32734/ijcas.v3i1.2623. Disponível em: https://idjpcr.usu.ac.id/ijcas/article/view/2623. Acesso em: 4 aug. 2025.