United States. Department of Commerce. "U.S. International Trade in Goods and Services: Annual Revision for 2015 : Full Release, BEA 15-24, CB 15-95, FT-900 (15-04),"
United States Department of Commerce News
(June 3, 2015).
https://fraser.stlouisfed.org/title/6148/item/602242/content/pdf/bea_newsreleases_20150603_a, accessed on May 30, 2026.