Chelsea Regita Gloria Hutagalung, Nanang Alamsyah, Mohammad Rachman Waluyo, and Wendy Febrianty Mardhiyah, “OPTIMIZING BUSINESS STRATEGIES THROUGH THE APPLICATION OF PRODUCT–SERVICE SYSTEMS (PSS) AT TUANG RUANG”, JBSMR, vol. 9, no. 1, pp. 99–102, Dec. 2025.