Sutjiatmo, Bayu Prabowo. “Analisis Ekspor Komoditi Kopi Indonesia Ke Singapura”. Jurnal Pendidikan Tambusai 5, no. 1 (April 22, 2021): 2641–2649. Accessed July 3, 2024. https://jptam.org/index.php/jptam/article/view/5982.