1. The Cinderella options: a study of modernized renewable energy technologies. Part 1: a technical assessment;Grubb;Energy Policy,1990
2. US DoE, Long Range Energy Projections to 2010, DoE/PE-0082, Washington, DC, forecasts renewables contributing 9.5%. of US energy supply by 2000 and 12% in 2010, compared with 7.6% at present — despite lowered demand projections.
3. New direction for AID renewable energy activity;US AID Office of Energy,1988
4. Renewable Energy: Progress, Prospects;Sawyer,1986