1. Annual Energy Outlook; 2011. Available at: 〈http://www.eia.gov/forecasts/aeo/〉 [accessed 24.04.11].
2. BP Statistical Review of World Energy June; 2011. Available at: 〈http://www.bp.com/sectionbodycopy.do?categoryId=7500&contentId=7068481〉 [accessed 06.06.11].
3. Ahammed S, Chaudhury AH. Diffusion of biogas technology: a community based approach. Available at: 〈http://www.bdresearch.org/home/attachments/article/500/Biogas.pdf〉 [accessed 16.06.11].
4. LGED, Local Government Engineering Department. Reducing greenhouse gas emissions by promoting bioenergy technologies for heat applications. Country report. Bioenergy Study-Bangladesh; 2006.
5. AED BANGLADESH. Available at: 〈http://www.pciaonline.org/aed-bangladesh〉 [accessed 14.02.11].