United States. Congress. Joint Economic Committee, 1956- and Eighty-Sixth Congress, 1959-1961. "Study Paper No. 20 : The Potential Economic Growth in the United State" in Materials Prepared in Connection with the Study of Employment, Growth, and Price Levels for Consideration by the Joint Economic Committee, Congress of the United States (January 30, 1960). https://fraser.stlouisfed.org/scribd/?item_id=3645&filepath=/files/docs/historical/jec/19600130_jec_empgrowth_studypaper20.pdf&start_page=1, accessed on September 20, 2017.
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