United States. Bureau of Economic Analysis. "July 2011," Survey of Current Business (July 2011). https://fraser.stlouisfed.org/title/46/item/10228, accessed on April 24, 2024.
United States. Bureau of Economic Analysis. "July 2011," Survey of Current Business (July 2011). https://fraser.stlouisfed.org/title/46/item/10228, accessed on April 24, 2024.