Andi Warnaen, Sugiyanto, Yayuk Yuliati, Edi Dwi Cahyono. The Effectiveness of the Role of Extension Agent in Empowerment Coffee Farmers in the Amstirdam Region in Malang Regency. IJAST [Internet]. 2020Jun.6 [cited 2024May7];29(05):11627-3. Available from: http://sersc.org/journals/index.php/IJAST/article/view/25357