1. Indonesian Energy Outlook. 2002.
2. El Bassam N. dan P. Maegaard. 2004. Integrated Renewable Energy or Rural Communities. Planning guidelines, Technologies and Applications. Elsevier. Amsterdam.
3. Yamada K, M. Kanada, Q. Wang, K. Sakamoto, I. Uchiyama, T. Mizoguchi dan Y. Zhou. 2005. Utility of Coal-Biomass Briquette for Remediation of Indoor Air Pollution Caused by Coal Burning in Rural Area, in China. Proceedings: Indoor Air 2005-3671.
4. Bergman R. dan J. Zerbe. 2004. Primer on Wood Biomass for Energy. USDA Forest Service, State and Private Forestry Technology Marketing Unit Forest Products Laboratory. Madison, Wisconsin.
5. Hill, J., Nelson, E., Tilman, D., Polasky, S., and Tiffany, D. Environmental, economic, and energetic costs and benefits of biodiesel and ethanol biofuels, Proc. Nat. Acad. Sci., 103, 11 206-11 210, 2006.