SYAFRIANI, syafriani; HERMIA, E. Pengembangan Usaha Petani Ubi Ungu di Rokan Hilir. Jurnal Medika: Medika, [S. l.], v. 2, n. 1, p. 1–6, 2023. Disponível em: http://journal.universitaspahlawan.ac.id/index.php/medika/article/view/13427. Acesso em: 22 jul. 2024.