Notes
1. Hrothgar J., Habakkuk, American and British Technology in the Nineteenth Century: the Search for Labour-Saving Inventions (Cambridge: Cambridge University Press, 1962).
2. Alan L., Olmstead, and Paul W. Rhode, Creating Abundance: Biological Innovation and American Agricultural Development (Cambridge: Cambridge University Press, 2008).
3. Joel Mokyr, Enlightened Economy: An Economic History of Britain, 1700–1850 (New Haven:Yale University Press, 2009).