“Influence of Quality Improvement Activities and Direct Selling Through Mediated Partnership Model on Supply Chain, Farm-Gate Price and Indonesian Households Specialty Coffee Farmers’ Income” (2016) Pelita Perkebunan (a Coffee and Cocoa Research Journal), 32(1), pp. 52–66. doi:10.22302/iccri.jur.pelitaperkebunan.v32i1.175.