Putra, S., Istiqomah, I., Gunawan, D. and Purnomo, S. 2020. Analisis Pendapatan dan Nilai Tambah Industri Pengolahan Kopi : Pendekatan Metode Hayami. Efficient: Indonesian Journal of Development Economics. 3, 3 (Dec. 2020), 994-1005. DOI:https://doi.org/10.15294/efficient.v3i3.43518.