United States. Bureau of Economic Analysis. "U.S. International Trade in Goods and Services: April 2003, CB 03-93, BEA 03-22, FT-900 (03-04),"
Bureau of Economic Analysis (BEA) News Releases
(June 13, 2003).
https://fraser.stlouisfed.org/title/6148/item/597868, accessed on July 19, 2025.