United States. Bureau of Labor Statistics. "Nonfinancial Corporations - Appendix - Quarterly Data," in United States. Bureau of Labor Statistics. "Third Quarter 2002 [Revised]," Productivity and Costs (December 4, 2002) : 15-15. https://fraser.stlouisfed.org/title/131/item/55949/toc/447351 , accessed on April 19, 2024.