United States. Bureau of Economic Analysis. "U.S. International Trade in Goods and Services, August 2007, BEA 07-49, CB 07-143, FT-900 (07-08),"
Bureau of Economic Analysis (BEA) News Releases
(October 11, 2007).
https://fraser.stlouisfed.org/title/6148/item/598989, accessed on March 15, 2025.