1. QUAAK, P., KNOEF, H.,STASSEN, H.E. Energy from Biomass. Washington, D.C., 1999, 78. s, ISBN 0-8213-4335-1 .
2. GELLER, H. Energy revolution: politics for a sustainable future. Washington, D.C.:Isnlanpress, 2003, 289s, ISBN 1-55963-965.
Technical journals, web sources.