MARIA HELENA CHANDRA; LODO, Nasarius Innosensius Peja. Analisis Sistem Kerja Unit Pengelolaan Hasil (UPH) Kopi Sinar Tani Berbasis Model Value Chain Porter. SOSMANIORA: Jurnal Ilmu Sosial dan Humaniora, [S. l.], v. 5, n. 2, p. 741–751, 2026. DOI: 10.55123/sosmaniora.v5i2.7673. Disponível em: https://journal.literasisains.id/index.php/sosmaniora/article/view/7673. Acesso em: 20 jun. 2026.