Doloriel, Nancy S. “Optimizing Resource Use in Upland Rice Farming: A Cobb-Douglas ProductivityAnalysis in Caraga Region, Philippines”. Jurnal Pengelolaan Sumberdaya Alam Dan Lingkungan (Journal of Natural Resources and Environmental Management), vol. 16, no. 3, May 2026, p. 301, https://doi.org/10.29244/jpsl.16.3.301.