1. National Exploration Committee. 2015. Jakarta.
2. Al-Jubori, A., Johnston, S., Boyer, C., Lambert, S., Butos, O., Pashin, J. and Wray, A., 2009. Coalbed Methane: Clean Energy for the World. Schlumberger.
3. Anderson, J., Simpson, M., Basinki, P., Beaton, A., Boyer, C., Bulat, D., Ray, S., Reinheimer, D., Schlachter, G., Colson, L., Olsen, T., John, Z., Khan, R., Low, N., Ryan, B. and Schoderbek, D., 2003. Producing Natural Gas from Coal. Autumn 2003. USA: Schlumberger, p. 31.
4. ASEAN Centre for Energy, 2015. ASEAN Plan of Actions for Energy Cooperation. Phase I. [online] Jakarta: ASEAN Centre for Energy, p. 3. Available at: https://policy.asiapacificenergy.org/sites/default/files/HighRes-APAEC%202016-2025.pdf [Accessed 9 November 2020].
5. Asian Development Bank, 2020. Renewable Energy Tariff and Incentives in Indonesia. Review and Recommendation. [online] Manila: Asian Development Bank. Available at: https://www.adb.org/sites/default/files/publication/635886/renewable-energy-tariffs-incentives-indonesia.pdf [Accessed 11 November 2020].