Abi Zulkarnain, M., E. . Kasymir, and Y. . Saleh. “Analisis Nilai Tambah, Pendapatan, Dan Bauran Pemasaran Kopi Pada Agroindustri Kopi Bubuk Klangenan Pringsewu”. Journal of Food System and Agribusiness, vol. 7, no. 2, Oct. 2023, pp. 141-52, https://jurnal.polinela.ac.id/JFA/article/view/2231.