United States. Bureau of Labor Statistics. "Manufacturing Sector - Appendix - Quarterly Data," in United States. Bureau of Labor Statistics. "Second Quarter 1994 [Preliminary]," Productivity and Costs (August 9, 1994) : 20-20. https://fraser.stlouisfed.org/title/131/item/55916/toc/486092 , accessed on April 19, 2024.