United States. Bureau of Labor Statistics. "Durable Manufacturing Sector - Appendix - Quarterly Data," in United States. Bureau of Labor Statistics. "First Quarter 1996 [Revised]," Productivity and Costs (June 18, 1996) : 16-16. https://fraser.stlouisfed.org/title/131/item/55920/toc/492602 , accessed on April 18, 2024.