United States. Bureau of Economic Analysis. "U.S. International Trade in Goods and Services, February 2012, BEA 12-13, CB 12-59, FT-900 (12-02),"
Bureau of Economic Analysis (BEA) News Releases
(April 12, 2012).
https://fraser.stlouisfed.org/title/6148/item/601327, accessed on June 19, 2025.