Andriadi, A., R. Ismail, F. Fikarwin, B. Badaruddin, R. Manurung, and H. Sitorus. “Coffee Marketing Mechanism: Social Relations Between Farmers, Collectors, Certification Cooperatives, and Exporters in Aceh, Indonesia”. Pelita Perkebunan (a Coffee and Cocoa Research Journal), Vol. 35, no. 2, Aug. 2019, pp. 156-6, doi:10.22302/iccri.jur.pelitaperkebunan.v35i2.383.