Zulfiandri, Zulfiandri, M. Syamsul Maarif, Aji Hermawan, and Hartrisari Hardjomidjojo. 2017. “The Transformation Process of Cocoa Farmers Groups to Agro-Industry Groups in Indonesia: A Soft System Methodology Approach”. International Journal of Sciences: Basic and Applied Research (IJSBAR) 31 (1):1-30. https://www.gssrr.org/index.php/JournalOfBasicAndApplied/article/view/6715.