NirmalaB., & HardjantoA. (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