Fadah, Isti, and Handriyono. “The Performance Improvement Model of Group and Partnership Based Coffee Processing Enterprises in the Jember Regency”. Journal of Social and Development Sciences 6, no. 1 (March 30, 2015): 7–13. Accessed October 25, 2026. https://amhinternational.com/jsds/article/view/4143-the-performance-improvement-model-of-group-and-partnership-based-coffee-processing-enterprises-in-the-jember-regency.