1. American Solar Energy Society, 2007. Tackling Climate Change in the US.
2. Ardente, F., Beccali, M., Cellura, M., Brano, V., 2006. Energy performances and lifecycle assessment of an Italian wind farm, Dipartimento di Ricerche Energetiche ed Ambientali (DREAM), Università di Palermo, Italy.
3. Brisa, 2006. Brisa Autoestradas de Portugal, S.A., Sustainable report, 2006, 〈http://www.brisa.pt〉.
4. EPANET software—〈http://www.epanet.com/〉.
5. European Small Hydropower Association (ESHA) 2007—〈http://www.esha.be/〉.