Nirmala, Bella, and Arini Hardjanto. “Analisis Efisiensi Usahatani Kopi Robusta Di Desa Purwabakti Kecamatan Pamijahan Kabupaten Bogor”. Indonesian Journal of Agricultural Resource and Environmental Economics 1, no. 1 (June 30, 2022): 1-10. Accessed May 3, 2024. https://jurnal.ipb.ac.id/index.php/ijaree/article/view/40137.