“Increased Productivity and Technical Efficiency of Rice Farming With the System of Rice Intensification (SRI) Method in Purworejo District, Central Java”. Journal of Economics, Business, and Accountancy Ventura 19, no. 1 (July 31, 2016): 49–58. Accessed September 18, 2025. https://journal.perbanas.ac.id/index.php/jebav/article/view/535.