United States. Department of Commerce. "U.S. International Trade in Goods and Services: July 2014, BEA 14-42, CB 14-162, FT-900 (14-07),"
United States Department of Commerce News
(September 4, 2014).
https://fraser.stlouisfed.org/title/6148/item/602121, accessed on June 2, 2026.