Puspa Yoga, Andini, Rahmat Syahni, and Hasnah Hasnah. “TECHNICAL EFFICIENCY OF COFFEE FARMING IN LIMA PULUH KOTA REGENCY, WEST SUMATRA PROVINCE”. Jurnal Ekonomi 12, no. 3 (August 11, 2023): 1786–1796. Accessed May 11, 2026. https://ejournal.seaninstitute.or.id/index.php/Ekonomi/article/view/2341.