United States. Department of Commerce. "U.S. International Trade in Goods and Services: Annual Revision for 2015 : Full Release, BEA 16-27, CB 16-98, FT-900 (16-04),"
United States Department of Commerce News
(June 3, 2016).
https://fraser.stlouisfed.org/title/6148/item/602345/content/pdf/bea_newsreleases_20160603, accessed on May 31, 2026.