Aripbilah, Safrudin Nor, and Heri Suprapto. “ANALISIS KEKERINGAN DI KABUPATEN SRAGEN DENGAN METODE PALMER, THORNTHWAITE, DAN STANDARDIZED PRECIPITATION INDEX”. JURNAL SUMBER DAYA AIR 17, no. 2 (November 30, 2021): 111–124. Accessed November 7, 2025. http://jurnalsda-dev.pusair-pu.go.id/index.php/JSDA/article/view/742.