United States. Bureau of Labor Statistics. "Nondurable Manufacturing Sector - Appendix - Quarterly Data," in United States. Bureau of Labor Statistics. "First Quarter 1995 [Revised]," Productivity and Costs (June 21, 1995) : 20-20. https://fraser.stlouisfed.org/title/131/item/55919/toc/488627 , accessed on May 2, 2024.