LINDA SIPAYUNG, MEI; MV NAINGGOLAN, Theodora; NAINGGOLAN, Tiurmaida. Coffee Business Development Index Analysis Arabica (Coffea Arabica) in Purba District, Simalungun Regency, North Sumatra Province. Journal of Environmental and Agricultural Studies, [S. l.], v. 2, n. 2, p. 36–49, 2021. DOI: 10.32996/jeas.2021.2.2.4. Disponível em: https://al-kindipublishers.org/index.php/jeas/article/view/2237. Acesso em: 22 nov. 2025.