Nazaruddin, Muhammad, Abdullah Akhyar Nasution, Awaluddin, and Ade Ikhsan Kamil. “Coffee Farmers in Gayo Highlands: Comparison of Cultivation Practice Between Farmers of Local Gayonese and Javanese Transmigrants”. International Journal of Criminology and Sociology 10 (April 30, 2021): 951–959. Accessed November 22, 2024. https://mail.lifescienceglobal.com/pms/index.php/ijcs/article/view/7469.