Yenfrida Silitonga; Nurhayati; Muhammad Rizwan. QUALITY STUDY OF ARABICA COFFEE COMMODITY (Coffea Arabica L.) BASED ON SNI COFFEE BEANS No. 01-2907-2008 REVIEWED FROM THE ASPECT OF GOOD AGRICULTURAL PRACTICES (GAP) IN SIMALUNGUN REGENCY. IJEBAS 2025, 5, 1383-1389.