United States. Department of Commerce. "U.S. International Trade in Goods and Services: June 2014, BEA 14-36, CB 14-146, FT-900 (14-06),"
United States Department of Commerce News
(August 6, 2014).
https://fraser.stlouisfed.org/title/6148/item/602115, accessed on June 2, 2026.