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2. OECD/IEA, Indonesia 2015 (International Energy Agency, Paris, 2015).
3. Biogas Implementation as Waste Management Effort in Lembang Sub-district, West Bandung District
4. BPS Kota Surakarta, Kota Surakarta dalam Angka 2020 (Badan Pusat Statistik (BPS) Kota Surakarta, Surakarta, 2020).
5. PT. Solo Citra Metro Plasma Power, Laporan Final Studi Penyambungan Tegangan Menengah PLTSa Surakarta 5 MW (Surakarta, 2018).