HadiRizky Maulidita Pratama, Tarsicius Sutikto, dan Cahyoadi Bowo. “Indeks Produktivitas Tanah Berbasis Soil Taxonomy Dan Korelasinya Dengan Produktivitas Kopi Pada Beberapa Ordo Tanah: Soil Productivity Index Based on Soil Taxonomy and Its Correlation With Coffee Productivity in Several Soil Orders”. Jurnal Ilmu Tanah dan Lingkungan 21, no. 1 (April 1, 2019): 7-12. Diakses Mei 17, 2024. https://jurnal.ipb.ac.id/index.php/jtanah/article/view/29287.