“Technical and Economic Efficiency of Smallholder Arabica Coffee Farming in Panti Sub-District, Jember”. Pelita Perkebunan (a Coffee and Cocoa Research Journal), vol. 33, no. 1, Apr. 2017, pp. 51-56, https://doi.org/10.22302/iccri.jur.pelitaperkebunan.v33i1.255.