NirmalaB. and HardjantoA. (2022) “Analisis Efisiensi Usahatani Kopi Robusta di Desa Purwabakti Kecamatan Pamijahan Kabupaten Bogor”, Indonesian Journal of Agricultural Resource and Environmental Economics, 1(1), pp. 1-10. doi: 10.29244/ijaree.v1i1.40137.