United States. Bureau of Economic Analysis. "U.S. International Trade in Goods and Services: June 2013, BEA 13-36, CB 13-139, FT-900 (13-06)," Bureau of Economic Analysis (BEA) News Releases (August 6, 2013). https://fraser.stlouisfed.org/title/6148/item/601559, accessed on September 18, 2024.