United States. Bureau of Labor Statistics. "Nondurable Manufacturing Sector," in United States. Bureau of Labor Statistics. "Third Quarter 1989 [Revised] : Business, Nonfarm Business, Manufacturing, and Nonfinancial Corporations," Productivity and Costs (December 6, 1989) : 11-11. https://fraser.stlouisfed.org/title/131/item/55909/toc/458646 , accessed on April 25, 2024.