United States. Congress. Joint Economic Committee, 1956- and Eighty-Sixth Congress, 1959-1961. "Study Paper No. 6 : The Extent and Nature of Frictional Unemployment" 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 (November 19, 1959). https://fraser.stlouisfed.org/title/1244/item/3640, accessed on January 15, 2019.
Government Printing Office