1. Frontline Bioenergy, LCC. Available at: www.frontlinebioenergy.com/biomass_energy_feedstock_prices.asp (09-17-08).
2. Buffington, D.E. & Wilson, T.O. Penn State Agricultural and Biological Engineering. Available at: www.abe.psu.edu/extension/factsheets/h/H82.pdf (09-17-08).
3. US Department of Energy Efficiency and Renewable Energy. Available at: www1.eere.energy.gov/biomass/biomass_basics_faqs.html (09-18-08).
4. Biodiesel fuel production from algae as renewable energy;Sharif Hossain;American Journal of Biotechnology and Biotechnology,2008
5. Biomass energy in developing countries;Ramsay;Energy Policy,1985