United States. Department of Commerce. "Gross Domestic Product: Second Quarter 2011 (Third Estimate) | Corporate Profits: Second Quarter 2011 (Revised Estimate), BEA 11-49,"
United States Department of Commerce News
(September 29, 2011).
https://fraser.stlouisfed.org/title/6148/item/604109, accessed on June 17, 2026.