United States. Department of Commerce. "Gross Domestic Product: First Quarter 2013 (Second Estimate) | Corporate Profits: First Quarter 2013 (Preliminary Estimate), BEA 13-21,"
United States Department of Commerce News
(May 30, 2013).
https://fraser.stlouisfed.org/title/6148/item/601545, accessed on June 13, 2026.