Fajar, Undang, MTF Sitorus, AH Darmawan, and S.M.P. Tjondronegoro. 2008. “The Social Structure of Peasent Community and Its Implicationto Welfare Differentiation.A Case Study on Cocoa Peasant Community in Central Sulawesi and Nangroe Aceh Darussalam”. Pelita Perkebunan (a Coffee and Cocoa Research Journal) 24 (3). https://doi.org/10.22302/iccri.jur.pelitaperkebunan.v24i3.102.