Nirmala, Bella, and Arini Hardjanto. 2022. “Analisis Efisiensi Usahatani Kopi Robusta Di Desa Purwabakti Kecamatan Pamijahan Kabupaten Bogor”. Indonesian Journal of Agricultural Resource and Environmental Economics 1 (1), 1-10. https://doi.org/10.29244/ijaree.v1i1.40137.