United States. Bureau of Economic Analysis. "U.S. International Trade in Goods and Services: May 2014 : Highlights: May 2014 Trade Gap is $44.4 Billion, BEA 14-32, CB 14-126, FT-900 (14-05),"
Bureau of Economic Analysis (BEA) News Releases
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https://fraser.stlouisfed.org/title/6148/item/602111/content/pdf/bea_newsreleases_20140703_release-highlights, accessed on June 22, 2025.