"Alternative energy." Britannica School. Encyclopædia Britannica, Inc., 2015. 
     Web. 16 Sep. 2015. <http://school.eb.com/levels/elementary/article/ 
     476218>. Define renewable vs. non renewable energy sources 
View live Web page

Armentrout, David, and Patricia Armentrout. "Let's Explore Science: Solar 
     Energy." Let's Explore Science: Solar Energy. Jan. 2009: n.pag. SIRS 
     Discoverer. Web. 16 Sep. 2015. Look for advantages/disadvantages 
     section 
View live Web page

Armentrout, David, and Patricia Armentrout. "Let's Explore Science: Wind 
     Energy." Let's Explore Science: Wind Energy. 01 Jan. 2009: n.pag. SIRS 
     Discoverer. Web. 16 Sep. 2015. Look for 
     advantages/disadvantages section 
View live Web page

Armentrout, David, and Patricia Armentrout. "Let's Explore Science: Biofuels." 
     Let's Explore Science: Biofuels. 01 Jan. 2009: n.pag.SIRS Discoverer. 
     Web. 16 Sep. 2015. Look for the advantages/disadvantages section 
View live Web page

Belsie, Laurent. "Soybeans and Corn Power Their Way into Fuel Options." 
     Christian Science Monitor. 05 Mar. 2001: n.p. SIRS Discoverer. Web. 16 
     Sep. 2015. High level article - use "listen to" feature 
View live Web page

"Biomass Video Collection." Discovery Education. N.p., n.d. Web. 15 Sept. 2015. 
     <https://google.discoveryeducation.com/player/view/assetGuid/ 
     5669AC5C-B285-49CE-C504-937B0F63FE78>. 
View live Web page

Brain, Marshall. "How Stuff Works: How Concentrating Solar Collectors Work." 
     How Stuff Works. 08 Apr. 2008: n.p. SIRS Discoverer.Web. 16 Sep. 2015. 
     Middle level source 
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Crane, Cody. "Bright Future." Science World 70.11 (2014): 8. Middle Search Plus. 
     Web. 16 Sept. 2015. Middle-level overview. 
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Fournier, Christine. "Harvesting The Wind." Jack & Jill 72.2 (2010): 24. 
     Middle Search Plus. Web. 16 Sept. 2015. 
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Griggs, Mary Beth. "Catching the Wind." SuperScience. Apr. 2015: 10+. SIRS 
     Discoverer. Web. 16 Sep. 2015. Excellent diagram included 
View live Web page

Hall, Phoebe. "From Corn Waste To Bio-Fuel." E: The Environmental Magazine 16.1 
     (2005): 10. Middle Search Plus. Web. 16 Sept. 2015. High level article use 
     "listen-to" feature 
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"Hydropower." SIRS Digests. Fall 1996: n.p. SIRS Discoverer. Web. 16 Sep. 2015. 
     High level article use "listen to " feature 
View live Web page

"Hydropower Video & Image Collection." Discovery Education. N.p., n.d. Web. 15 
     Sept. 2015. <https://google.discoveryeducation.com/player/view/assetGuid/ 
     58128B3A-0C9C-1FBF-57F2-A64B55E3DD58>. 
View live Web page

Langefeld, Maximilian. "A Source of Power." Dig into History. Feb. 2015: 34-37. 
     SIRS Discoverer. Web. 16 Sep. 2015. High level article use the "listen 
     to" feature 
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Linde, Barbara M. "Alternative Energy." Salem Press Primary Encyclopedia (2015): 
     Topic Overviews K-5. Web. 16 Sept. 2015. Great diagram in this 
     encyclopedia article 
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"Natural resource." Britannica School. Encyclopædia Britannica, Inc., 2015. Web. 
     16 Sep. 2015. <http://school.eb.com/levels/elementary/article/ 
     399553#252017>. Define renewable vs. nonrenewable 
View live Web page

Ramaley, Shirley Anne. "The Power Of Water." Boys' Quest 18.2 (2012): 6. 
     Middle Search Plus. Web. 16 Sept. 2015.
View live Web page 

"Saving Our Nation's Rivers." Mother Earth News 131 (1992): 8. Middle Search 
     Plus. Web. 16 Sept. 2015. hydropower disadvantage
View live Web page

"Solar Energy Video Collection." Discovery Education. N.p., n.d. Web. 15 Sept. 
     2015. <https://google.discoveryeducation.com/player/view/assetGuid/ 
     54CE3702-9DC1-982D-C228-6714029656A2>. 
View live Web page

"This Bus Runs On WHAT?!." Scholastic News -- Edition 5/6 83.20 (2015): 3. 
     Middle Search Plus. Web. 16 Sept. 2015. 
View live Web page

Ulmer, Cheryl. "Dams." Science Weekly (Level D). 16 Apr. 1999: n.p. SIRS 
     Discoverer. Web. 16 Sep. 2015. 
View live Web page

"Water Work." Try This. 05 Nov. 2013: n.p. SIRS Discoverer. Web. 16 Sep. 2015. A 
     hydropower science experiment to try at home 
View live Web page

"Wind Energy Video & Image Collection." Discovery Education. N.p., n.d. Web. 15 
     Sept. 2015. <https://google.discoveryeducation.com/player/view/assetGuid/ 
     56321F25-04BE-4E32-826F-B1E76C86B834>. 
View live Web page