Wahyudi, Rizky. 2023. “DEVELOPMENT OF AGRICULTURAL BUSINESS IN INCREASING THE CULTIVATION OF ARABICA COFFEE PLANTS (COFFEA ARABICA L) IN MANDAILING NATAL REGENCY: PENGEMBANGAN USAHA TANI DALAM PENINGKATAN BUDIDAYA TANAMAN KOPI ARABIKA (COFFEA ARABICA L) DI KABUPATEN MANDAILING NATAL”. UPMI Proceeding Series 1 (01):608-11. https://doi.org/10.55751/ups.v1i01.95.