Hariadi, Tony K., Milou Derks, Agus Jamal, and Slamet Riyadi. “Renewable Energy Investment for Middle and Upper Class Housing Sector in Indonesia: Investigating the Scope for a Change in Policy”. Journal of Electrical Technology UMY 2, no. 1 (November 22, 2019): 12–18. Accessed April 30, 2025. https://journal.umy.ac.id/index.php/jet/article/view/6326.