Harahap, R. Hamdani, Abdul Rauf, Rahmawaty, Isfenti Sadalia, Farid Aulia, and Abdullah Akhyar Nasution. “Adoption of Good Agricultural Practices (GAP) Among Arabica Coffee Farmers in Simalungun, Indonesia”. Research on World Agricultural Economy 6, no. 4 (August 28, 2025): 191–204. Accessed September 8, 2025. https://journals.nasspublishing.com/index.php/rwae/article/view/1897.