Website URL: 1. www.hydropower.org/a-brief-history-of-hydropowerwww.hydropower.org/a-brief-history-of-hydropower, 2. www.energyinformative.org/hydroelectric-energy-pros-and-cons/, 3. www.Energyinformative.org/how-does-hydroelectric-power-work/, 4. www.environment-ecology.com/._/100-hydropower-and-the-environment.html Author: 1 International Hydropower Association, 2 Energy Informative, 3 Energy informative, 4. Environment ecology Title of publication: 1 A brief history of hydropower, 2 Pros and cons of hydropwoer, 3 How does hydroelectric power work, 4 Hydropower and the environment Date published: 1 unknown, 2 unknown, 3 unknown, 4 unknown Date viewed: 1. 29 Aug 2017, 2. 1 Sep 2017, 3. 25 Aug 2017 Publishing company: 1 none, 2 none, 3 none, 4 none