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"Field system. "Merriam-Webster. Merriam-Webster, Web. 1 Apr. 2015.
Matthews, Alan, and Suzanne O'Niel. "Technical Changes and Efficiency in Irish Agriculture." The Economic and Social Review 32.2 (2001): 263-284, Web. 3. Apr. 2015.
"Open-field system: Agriculture." Encyclopaedia Britannica. Encyclopaedia Britannica, Web. 1 Apr. 2015.
Overdyck, Elizabeth, Bruce D. Clarkson, Daniel C. Laughlin, and Chrissen E. C. Gemmill. "Testing Broadcast Seeding Methods to Restore Urban Forests in the Presence of Seed Predators." Restoration Ecology (2014): 763-69. Print.
Overton, Mark. "Agricultural Revolution 1500-1850." BBC: History. BBC, 17 Feb. 2011. Web. 2 Apr. 2015.
"Sustainability Information| EPA Research| EPA." EPA. Environmental Protection Agency, Web. Apr. 2015.
Reenen, John Van. "Wage Inequality, Technology and Trade: 21st Century Evidence." Labour Economics 18.6 (2011): 730-741. Science
Direct. Web, 9 Apr.2015.
"Rainmaker Project - English." Rainmaker Project - English. Rainmaker Project, 2008. Web. 11 May 2015. .
Alam, M.M, S.M.M. Hossain, M. A. Latif, K. aher, M. Y. Rafii, and M.I. Tajul. "Influence of Plant Population and Nitrogen-Fertilizer at Various Levels on Growth and Growth Efficiency of Maize." Scientific World Journal (2011). PMC: Us National Library of Medicine: National Institues of Health, Web. 8 Apr. 2015
"Three-field system." Merriam-Webster. Merriam-Webster, 2015, Web. 1 Apr. 2015.
"Tillage and No-Till Systems: Production News and Information from UNL Extension CropWatch | CropWatch | University of Nebraska-Lincoln." Tillage and No-Till Systems: Production News and Information from UNL Extension CropWatch | CropWatch | University of Nebraska-Lincoln. UNL, 2014. Web. 11 May 2015.
Harris, Mike Burtenshaw & Graham. "Experimental Archaeology Gardens Assessing the Productivity of Ancient Maori Cultivars of Sweet Potato, Ipomoea Batatas in New Zealand." Economic Botany (2007): 235-245. Article.
Macnab, J W. "Sweet Potatoes and Maori Terraces in the Wellington Area." n.d. JSTOR. Article. 02 March
Gudmundsson, J.S., Palmason, G. "The Geothermal Industry in Icleland." Geothermics Vol.16, No. 5/6,pp.567-573. (1987). Web.
Scott, Samuel. Gunnarsson, Ingvi. Arnorsson, Stefan. Stefansson, Andri. "Gas Chemistry, Boiling,and Phase Segregating in a Geothermal System, Hellisheidi, Iceland." Geochimica et Cosmochimica Acta. Vol. 124. (2014). pp.170-189. Web.
Promote Iceland, Invest in Iceland. Web. 11 May 2015.
Arnaron, Hordur. "IceLink Interconnector." The Icelandic Energy summit. Web. 11 May 2015.
Frieslander, Blaine. "Iceland President: Green Energy Forges Good Business." Cornell Cronicle, Cornell University. (2014). Web. 11 May 2015.