HadiRizky Maulidita Pratama, Tarsicius Sutikto, dan Cahyoadi Bowo. 2019. “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 (1), 7-12. https://doi.org/10.29244/jitl.21.1.7-12.