Maridjo, Herry, et al. “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, & Accountancy Ventura, vol. 19, no. 1, July 2016, pp. 49-58, https://doi.org/10.14414/jebav.v19i1.535.