United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "April 1992," PPI Detailed Report (April 1992) : 3-4. https://fraser.stlouisfed.org/title/63/item/21678/toc/121747 , accessed on April 19, 2024.
United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "April 1992," PPI Detailed Report (April 1992) : 3-4. https://fraser.stlouisfed.org/title/63/item/21678/toc/121747 , accessed on April 19, 2024.