United States. Department of Commerce. "U.S. International Trade in Goods and Services: November 2007, BEA 08-01, CB 08-07, FT-900 (07-11),"
United States Department of Commerce News
(January 11, 2008).
https://fraser.stlouisfed.org/title/6148/item/600434, accessed on June 8, 2026.