United States. Bureau of Labor Statistics. "Manufacturing Sector," in United States. Bureau of Labor Statistics. "Private Business, Nonfarm Business, and Manufacturing Sectors : Third Quarter 1980," Productivity and Costs (October 27, 1980) : 8-8. https://fraser.stlouisfed.org/title/131/item/55896/toc/437647 , accessed on April 27, 2024.