United States. Bureau of Labor Statistics. "Preliminary Multifactor Productivity Trends, 2005 : 2005 (Preliminary) : Private Business Sector, USDL 06-1510,"
Total Factor Productivity
(August 29, 2006).
https://fraser.stlouisfed.org/title/9665/item/707586/content/pdf/prod3_20060829, accessed on March 13, 2026.