United States. Bureau of Labor Statistics. Office of Productivity and Technology. Trends in Multifactor Productivity, 1948-81 : Bulletin of the United States Bureau of Labor Statistics, No. 2178. Washington, D.C: U.S. Dept. of Labor, Bureau of Labor Statistics, September 1983, https://fraser.stlouisfed.org/title/5229, accessed on August 6, 2024.