United States. Department of Commerce. "Gross Domestic Product: Second Quarter 2013 (Second Estimate) | Corporate Profits: Second Quarter 2013 (Preliminary Estimate), BEA 13-38,"
United States Department of Commerce News
(August 29, 2013).
https://fraser.stlouisfed.org/title/6148/item/601561, accessed on June 4, 2026.