H.S, Merry, Sugeng Raharto, & Titin Agustina. " PROSPEK PENGEMBANGAN KOMODITAS KOPI ROBUSTA DI PT. KALIPUTIH KECAMATAN LEDOKOMBO KABUPATEN JEMBER." JSEP (Journal of Social and Agricultural Economics) [Online], 8.2 (2015): 11-24. Web. 24 Apr. 2024