United States. Department of Commerce. "U.S. International Trade in Goods and Services: October 2008, BEA 08-53, CB 08-178, FT-900 (08-10),"
United States Department of Commerce News
(December 11, 2008).
https://fraser.stlouisfed.org/title/6148/item/600484, accessed on June 2, 2026.