Upboff, Norman. “THE SYSTEM OF RICE INTENSIFICATION (SRI) AS A SYSTEM OF AGRICULTURAL INNOVATION”. Jurnal Ilmu Tanah dan Lingkungan 10, no. 1 (April 1, 2008): 27–40. Accessed September 12, 2026. https://journal.ipb.ac.id/jtanah/article/view/29509.