United States. Bureau of Economic Analysis. "U.S. International Trade in Goods and Services March 2013 : Full Release, BEA 13-20, CB 13-66, FT-900 (13-03),"
Bureau of Economic Analysis (BEA) News Releases
(May 2, 2013).
https://fraser.stlouisfed.org/title/6148/item/601544/content/pdf/bea_newsreleases_20130502, accessed on July 4, 2025.