Maria Helena Chandra, and Nasarius Innosensius Peja Lodo. 2026. “Analisis Sistem Kerja Unit Pengelolaan Hasil (UPH) Kopi Sinar Tani Berbasis Model Value Chain Porter”. SOSMANIORA: Jurnal Ilmu Sosial Dan Humaniora 5 (2):741-51. https://doi.org/10.55123/sosmaniora.v5i2.7673.