Sari Tarumasely, and Susi Siswati. “Analisis Rasio Profitabilitas Pada PDAM Tirta Merapi Kabupaten Klaten Berdasarkan Operating Profit Margin, Net Profit Margin, Return On Asset Dan Return On Equity”. EQUILIBRIUM - Jurnal Bisnis dan Akuntansi 15, no. 1 (April 30, 2021). Accessed April 18, 2026. https://journal.ukrim.ac.id/index.php/jem/article/view/226.