Andriadi, A., Ismail, R., Fikarwin, F., Badaruddin, B., Manurung, R. and Sitorus, H. (2019) “Coffee Marketing Mechanism: Social Relations Between Farmers, Collectors, Certification Cooperatives, and Exporters in Aceh, Indonesia”, Pelita Perkebunan (a Coffee and Cocoa Research Journal), 35(2), pp. 156-166. doi: 10.22302/iccri.jur.pelitaperkebunan.v35i2.383.